diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb5c9d46..1bdb2942 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- **Custom HTTP headers**: A new "Custom HTTP Headers" section in Advanced Network Settings lets you define arbitrary key-value header pairs that are sent with every API request. Useful for authenticating through reverse proxies or gateways that require headers like `X-API-Key` or `CF-Access-Client-Id`.
+
 ## [1.9.0-beta1] - 2026-06-09
 
 ### Added
diff --git a/app/src/main/java/com/matedroid/data/local/SettingsDataStore.kt b/app/src/main/java/com/matedroid/data/local/SettingsDataStore.kt
index 76a3ad6a..26c32d65 100644
--- a/app/src/main/java/com/matedroid/data/local/SettingsDataStore.kt
+++ b/app/src/main/java/com/matedroid/data/local/SettingsDataStore.kt
@@ -54,7 +54,8 @@ data class AppSettings(
     val currencyCode: String = "EUR",
     val showShortDrivesCharges: Boolean = false,
     val teslamateBaseUrl: String = "",
-    val lastSelectedCarId: Int? = null
+    val lastSelectedCarId: Int? = null,
+    val customHeaders: Map<String, String> = emptyMap()
 ) {
     val isConfigured: Boolean
         get() = serverUrl.isNotBlank()
@@ -79,6 +80,7 @@ class SettingsDataStore @Inject constructor(
     private val lastSelectedCarIdKey = intPreferencesKey("last_selected_car_id")
     private val carImageOverridesKey = stringPreferencesKey("car_image_overrides")
     private val notificationPermissionAskedKey = booleanPreferencesKey("notification_permission_asked")
+    private val customHeadersKey = stringPreferencesKey("custom_headers")
 
     val notificationPermissionAsked: Flow<Boolean> = context.dataStore.data.map { preferences ->
         preferences[notificationPermissionAskedKey] ?: false
@@ -95,7 +97,8 @@ class SettingsDataStore @Inject constructor(
             currencyCode = preferences[currencyCodeKey] ?: "EUR",
             showShortDrivesCharges = preferences[showShortDrivesChargesKey] ?: false,
             teslamateBaseUrl = preferences[teslamateBaseUrlKey] ?: "",
-            lastSelectedCarId = preferences[lastSelectedCarIdKey]
+            lastSelectedCarId = preferences[lastSelectedCarIdKey],
+            customHeaders = parseCustomHeadersJson(preferences[customHeadersKey] ?: "{}")
         )
     }
 
@@ -150,7 +153,8 @@ class SettingsDataStore @Inject constructor(
         httpBasicAuthUsername: String,
         httpBasicAuthPassword: String,
         acceptInvalidCerts: Boolean,
-        currencyCode: String
+        currencyCode: String,
+        customHeaders: Map<String, String> = emptyMap()
     ) {
         context.dataStore.edit { preferences ->
             preferences[serverUrlKey] = serverUrl
@@ -160,9 +164,33 @@ class SettingsDataStore @Inject constructor(
             preferences[httpBasicAuthPasswordKey] = httpBasicAuthPassword
             preferences[acceptInvalidCertsKey] = acceptInvalidCerts
             preferences[currencyCodeKey] = currencyCode
+            preferences[customHeadersKey] = customHeadersToJson(customHeaders)
         }
     }
 
+    private fun parseCustomHeadersJson(jsonString: String): Map<String, String> {
+        return try {
+            val result = mutableMapOf<String, String>()
+            val obj = JSONObject(jsonString)
+            val keys = obj.keys()
+            while (keys.hasNext()) {
+                val key = keys.next()
+                result[key] = obj.getString(key)
+            }
+            result
+        } catch (e: Exception) {
+            emptyMap()
+        }
+    }
+
+    private fun customHeadersToJson(headers: Map<String, String>): String {
+        val obj = JSONObject()
+        for ((key, value) in headers) {
+            obj.put(key, value)
+        }
+        return obj.toString()
+    }
+
     suspend fun saveHttpBasicAuth(username: String, password: String) {
         context.dataStore.edit { preferences ->
             preferences[httpBasicAuthUsernameKey] = username
diff --git a/app/src/main/java/com/matedroid/di/NetworkModule.kt b/app/src/main/java/com/matedroid/di/NetworkModule.kt
index fa62e894..fbd40915 100644
--- a/app/src/main/java/com/matedroid/di/NetworkModule.kt
+++ b/app/src/main/java/com/matedroid/di/NetworkModule.kt
@@ -98,7 +98,8 @@ private data class ApiCacheKey(
     val acceptInvalidCerts: Boolean,
     val apiToken: String,
     val httpBasicAuthUsername: String,
-    val httpBasicAuthPassword: String
+    val httpBasicAuthPassword: String,
+    val customHeaders: Map<String, String>
 )
 
 /**
@@ -128,14 +129,15 @@ class TeslamateApiFactory(
         val apiToken = settings.apiToken
         val basicAuthUsername = settings.httpBasicAuthUsername
         val basicAuthPassword = settings.httpBasicAuthPassword
+        val customHeaders = settings.customHeaders
 
-        val cacheKey = ApiCacheKey(normalizedUrl, useInsecure, apiToken, basicAuthUsername, basicAuthPassword)
+        val cacheKey = ApiCacheKey(normalizedUrl, useInsecure, apiToken, basicAuthUsername, basicAuthPassword, customHeaders)
 
         // Return cached API if available
         apiCache[cacheKey]?.let { return it }
 
         // Create new API instance
-        val okHttpClient = createOkHttpClient(apiToken, useInsecure, basicAuthUsername, basicAuthPassword)
+        val okHttpClient = createOkHttpClient(apiToken, useInsecure, basicAuthUsername, basicAuthPassword, customHeaders)
 
         val api = Retrofit.Builder()
             .baseUrl(normalizedUrl)
@@ -168,7 +170,8 @@ class TeslamateApiFactory(
         apiToken: String,
         acceptInvalidCerts: Boolean,
         basicAuthUsername: String = "",
-        basicAuthPassword: String = ""
+        basicAuthPassword: String = "",
+        customHeaders: Map<String, String> = emptyMap()
     ): OkHttpClient {
         val builder = OkHttpClient.Builder()
             .addInterceptor { chain ->
@@ -181,6 +184,12 @@ class TeslamateApiFactory(
                 if (apiToken.isNotBlank()) {
                     requestBuilder.addHeader("Authorization", "Bearer $apiToken")
                 }
+                // Custom headers are applied last so they can override built-in headers if needed
+                for ((key, value) in customHeaders) {
+                    if (key.isNotBlank()) {
+                        requestBuilder.header(key, value)
+                    }
+                }
                 chain.proceed(requestBuilder.build())
             }
             .connectTimeout(1, TimeUnit.SECONDS)
diff --git a/app/src/main/java/com/matedroid/ui/screens/settings/SettingsScreen.kt b/app/src/main/java/com/matedroid/ui/screens/settings/SettingsScreen.kt
index ff2c9b3b..5f9f7b8c 100644
--- a/app/src/main/java/com/matedroid/ui/screens/settings/SettingsScreen.kt
+++ b/app/src/main/java/com/matedroid/ui/screens/settings/SettingsScreen.kt
@@ -53,6 +53,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.saveable.rememberSaveable
@@ -129,6 +130,10 @@ fun SettingsScreen(
                 onShowShortDrivesChargesChange = viewModel::updateShowShortDrivesCharges,
                 onTestConnection = viewModel::testConnection,
                 onSave = { viewModel.saveSettings(onNavigateToDashboard) },
+                onAddCustomHeader = viewModel::addCustomHeader,
+                onRemoveCustomHeader = viewModel::removeCustomHeader,
+                onCustomHeaderKeyChange = viewModel::updateCustomHeaderKey,
+                onCustomHeaderValueChange = viewModel::updateCustomHeaderValue,
                 onPalettePreview = onNavigateToPalettePreview,
                 onForceResync = viewModel::forceResync,
                 onSimulateTpmsWarning = viewModel::simulateTpmsWarning,
@@ -200,6 +205,10 @@ private fun SettingsContent(
     onShowShortDrivesChargesChange: (Boolean) -> Unit,
     onTestConnection: () -> Unit,
     onSave: () -> Unit,
+    onAddCustomHeader: () -> Unit = {},
+    onRemoveCustomHeader: (Int) -> Unit = {},
+    onCustomHeaderKeyChange: (Int, String) -> Unit = { _, _ -> },
+    onCustomHeaderValueChange: (Int, String) -> Unit = { _, _ -> },
     onPalettePreview: () -> Unit = {},
     onForceResync: () -> Unit = {},
     onSimulateTpmsWarning: (TirePosition) -> Unit = {},
@@ -431,6 +440,92 @@ private fun SettingsContent(
                 }
             }
 
+            Spacer(modifier = Modifier.height(16.dp))
+
+            // Custom HTTP Headers
+            Text(
+                text = stringResource(R.string.settings_custom_headers_title),
+                style = MaterialTheme.typography.bodyMedium,
+                fontWeight = FontWeight.Medium
+            )
+            Text(
+                text = stringResource(R.string.settings_custom_headers_hint),
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.padding(top = 4.dp, bottom = 8.dp)
+            )
+
+            // Per-row visibility state for header values; grows/shrinks with the list
+            val headerValueVisible = remember { mutableStateListOf<Boolean>() }
+            while (headerValueVisible.size < uiState.customHeaders.size) headerValueVisible.add(false)
+            while (headerValueVisible.size > uiState.customHeaders.size) headerValueVisible.removeLastOrNull()
+
+            uiState.customHeaders.forEachIndexed { index, (key, value) ->
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(bottom = 8.dp),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    OutlinedTextField(
+                        value = key,
+                        onValueChange = { onCustomHeaderKeyChange(index, it) },
+                        placeholder = { Text(stringResource(R.string.settings_custom_headers_key_placeholder)) },
+                        modifier = Modifier.weight(1f),
+                        singleLine = true,
+                        enabled = !uiState.isTesting && !uiState.isSaving
+                    )
+                    Spacer(modifier = Modifier.width(8.dp))
+                    OutlinedTextField(
+                        value = value,
+                        onValueChange = { onCustomHeaderValueChange(index, it) },
+                        placeholder = { Text(stringResource(R.string.settings_custom_headers_value_placeholder)) },
+                        modifier = Modifier.weight(1f),
+                        singleLine = true,
+                        visualTransformation = if (headerValueVisible[index]) {
+                            VisualTransformation.None
+                        } else {
+                            PasswordVisualTransformation()
+                        },
+                        keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Password),
+                        trailingIcon = {
+                            IconButton(onClick = { headerValueVisible[index] = !headerValueVisible[index] }) {
+                                Icon(
+                                    imageVector = if (headerValueVisible[index]) {
+                                        Icons.Filled.VisibilityOff
+                                    } else {
+                                        Icons.Filled.Visibility
+                                    },
+                                    contentDescription = stringResource(
+                                        if (headerValueVisible[index]) R.string.hide_password else R.string.show_password
+                                    )
+                                )
+                            }
+                        },
+                        enabled = !uiState.isTesting && !uiState.isSaving
+                    )
+                    Spacer(modifier = Modifier.width(4.dp))
+                    IconButton(
+                        onClick = { onRemoveCustomHeader(index) },
+                        enabled = !uiState.isTesting && !uiState.isSaving
+                    ) {
+                        Icon(
+                            imageVector = Icons.Filled.Error,
+                            contentDescription = stringResource(R.string.settings_custom_headers_remove),
+                            tint = MaterialTheme.colorScheme.error
+                        )
+                    }
+                }
+            }
+
+            OutlinedButton(
+                onClick = onAddCustomHeader,
+                modifier = Modifier.fillMaxWidth(),
+                enabled = !uiState.isTesting && !uiState.isSaving
+            ) {
+                Text(stringResource(R.string.settings_custom_headers_add))
+            }
+
             Spacer(modifier = Modifier.height(8.dp))
         }
 
diff --git a/app/src/main/java/com/matedroid/ui/screens/settings/SettingsViewModel.kt b/app/src/main/java/com/matedroid/ui/screens/settings/SettingsViewModel.kt
index 680f8637..3f0d48ee 100644
--- a/app/src/main/java/com/matedroid/ui/screens/settings/SettingsViewModel.kt
+++ b/app/src/main/java/com/matedroid/ui/screens/settings/SettingsViewModel.kt
@@ -42,6 +42,7 @@ data class SettingsUiState(
     val acceptInvalidCerts: Boolean = false,
     val currencyCode: String = "EUR",
     val showShortDrivesCharges: Boolean = false,
+    val customHeaders: List<Pair<String, String>> = emptyList(),
     val isLoading: Boolean = true,
     val isTesting: Boolean = false,
     val isSaving: Boolean = false,
@@ -105,6 +106,7 @@ class SettingsViewModel @Inject constructor(
                 acceptInvalidCerts = settings.acceptInvalidCerts,
                 currencyCode = settings.currencyCode,
                 showShortDrivesCharges = settings.showShortDrivesCharges,
+                customHeaders = settings.customHeaders.entries.map { it.key to it.value },
                 isLoading = false
             )
         }
@@ -158,6 +160,30 @@ class SettingsViewModel @Inject constructor(
         }
     }
 
+    fun addCustomHeader() {
+        _uiState.value = _uiState.value.copy(
+            customHeaders = _uiState.value.customHeaders + ("" to "")
+        )
+    }
+
+    fun removeCustomHeader(index: Int) {
+        _uiState.value = _uiState.value.copy(
+            customHeaders = _uiState.value.customHeaders.toMutableList().also { it.removeAt(index) }
+        )
+    }
+
+    fun updateCustomHeaderKey(index: Int, key: String) {
+        val updated = _uiState.value.customHeaders.toMutableList()
+        updated[index] = key to updated[index].second
+        _uiState.value = _uiState.value.copy(customHeaders = updated)
+    }
+
+    fun updateCustomHeaderValue(index: Int, value: String) {
+        val updated = _uiState.value.customHeaders.toMutableList()
+        updated[index] = updated[index].first to value
+        _uiState.value = _uiState.value.copy(customHeaders = updated)
+    }
+
     fun updateAcceptInvalidCerts(accept: Boolean) {
         _uiState.value = _uiState.value.copy(
             acceptInvalidCerts = accept,
@@ -293,7 +319,10 @@ class SettingsViewModel @Inject constructor(
                     httpBasicAuthUsername = _uiState.value.httpBasicAuthUsername,
                     httpBasicAuthPassword = _uiState.value.httpBasicAuthPassword,
                     acceptInvalidCerts = _uiState.value.acceptInvalidCerts,
-                    currencyCode = _uiState.value.currencyCode
+                    currencyCode = _uiState.value.currencyCode,
+                    customHeaders = _uiState.value.customHeaders
+                        .filter { (key, _) -> key.isNotBlank() }
+                        .toMap()
                 )
 
                 // Trigger sync after settings are saved (handles first-time setup)
diff --git a/app/src/main/res/values-ca/strings.xml b/app/src/main/res/values-ca/strings.xml
index 4fe898c2..148094ea 100644
--- a/app/src/main/res/values-ca/strings.xml
+++ b/app/src/main/res/values-ca/strings.xml
@@ -237,6 +237,13 @@
     <string name="settings_accept_invalid_certs">Accepta certificats no vàlids</string>
     <string name="settings_accept_invalid_certs_hint">Activa per a certificats autofirmats</string>
     <string name="settings_accept_invalid_certs_warning">Desactivar la validació de certificats fa les connexions vulnerables a atacs man-in-the-middle. Usa només en xarxes de confiança.</string>
+    <!-- Custom HTTP headers section in advanced network settings -->
+    <string name="settings_custom_headers_title">Capçaleres HTTP personalitzades</string>
+    <string name="settings_custom_headers_hint">Afegeix capçaleres personalitzades enviades amb cada sol·licitud API (p.ex., per a autenticació de proxy).</string>
+    <string name="settings_custom_headers_key_placeholder">Nom de capçalera</string>
+    <string name="settings_custom_headers_value_placeholder">Valor de capçalera</string>
+    <string name="settings_custom_headers_add">Afegeix capçalera</string>
+    <string name="settings_custom_headers_remove">Elimina capçalera</string>
 
     <!-- Display settings section -->
     <string name="settings_display_title">Configuració de pantalla</string>
diff --git a/app/src/main/res/values-es/strings.xml b/app/src/main/res/values-es/strings.xml
index 0ca69fea..e1c80513 100644
--- a/app/src/main/res/values-es/strings.xml
+++ b/app/src/main/res/values-es/strings.xml
@@ -237,6 +237,13 @@
     <string name="settings_accept_invalid_certs">Aceptar certificados inválidos</string>
     <string name="settings_accept_invalid_certs_hint">Activar para certificados autofirmados</string>
     <string name="settings_accept_invalid_certs_warning">Desactivar la validación de certificados hace las conexiones vulnerables a ataques man-in-the-middle. Usa solo en redes de confianza.</string>
+    <!-- Custom HTTP headers section in advanced network settings -->
+    <string name="settings_custom_headers_title">Cabeceras HTTP personalizadas</string>
+    <string name="settings_custom_headers_hint">Añade cabeceras personalizadas enviadas con cada solicitud API (p.ej., para autenticación de proxy).</string>
+    <string name="settings_custom_headers_key_placeholder">Nombre de cabecera</string>
+    <string name="settings_custom_headers_value_placeholder">Valor de cabecera</string>
+    <string name="settings_custom_headers_add">Añadir cabecera</string>
+    <string name="settings_custom_headers_remove">Eliminar cabecera</string>
 
     <!-- Display settings section -->
     <string name="settings_display_title">Ajustes de pantalla</string>
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index e890f849..9b31810a 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -237,6 +237,13 @@
     <string name="settings_accept_invalid_certs">Accetta certificati non validi</string>
     <string name="settings_accept_invalid_certs_hint">Abilita per certificati autofirmati</string>
     <string name="settings_accept_invalid_certs_warning">Disabilitare la validazione dei certificati rende le connessioni vulnerabili ad attacchi man-in-the-middle. Usa solo su reti fidate.</string>
+    <!-- Custom HTTP headers section in advanced network settings -->
+    <string name="settings_custom_headers_title">Header HTTP personalizzati</string>
+    <string name="settings_custom_headers_hint">Aggiungi header personalizzati inviati con ogni richiesta API (es. per autenticazione proxy).</string>
+    <string name="settings_custom_headers_key_placeholder">Nome header</string>
+    <string name="settings_custom_headers_value_placeholder">Valore header</string>
+    <string name="settings_custom_headers_add">Aggiungi header</string>
+    <string name="settings_custom_headers_remove">Rimuovi header</string>
 
     <!-- Display settings section -->
     <string name="settings_display_title">Impostazioni schermo</string>
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index 441c8395..4d8a5897 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -237,6 +237,13 @@
     <string name="settings_accept_invalid_certs">接受无效证书</string>
     <string name="settings_accept_invalid_certs_hint">为自签名证书启用此选项</string>
     <string name="settings_accept_invalid_certs_warning">禁用证书验证会使连接容易受到中间人攻击。请仅在可信网络上使用。</string>
+    <!-- Custom HTTP headers section in advanced network settings -->
+    <string name="settings_custom_headers_title">自定义 HTTP 请求头</string>
+    <string name="settings_custom_headers_hint">添加随每次 API 请求发送的自定义请求头（例如，用于代理认证）。</string>
+    <string name="settings_custom_headers_key_placeholder">请求头名称</string>
+    <string name="settings_custom_headers_value_placeholder">请求头值</string>
+    <string name="settings_custom_headers_add">添加请求头</string>
+    <string name="settings_custom_headers_remove">删除请求头</string>
 
     <!-- Display settings section -->
     <string name="settings_display_title">显示设置</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c7a74226..f1f3d897 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -240,6 +240,13 @@
     <string name="settings_accept_invalid_certs">Accept invalid certificates</string>
     <string name="settings_accept_invalid_certs_hint">Enable for self-signed certificates</string>
     <string name="settings_accept_invalid_certs_warning">Disabling certificate validation makes connections vulnerable to man-in-the-middle attacks. Only use on trusted networks.</string>
+    <!-- Custom HTTP headers section in advanced network settings -->
+    <string name="settings_custom_headers_title">Custom HTTP Headers</string>
+    <string name="settings_custom_headers_hint">Add custom headers sent with every API request (e.g., for proxy authentication).</string>
+    <string name="settings_custom_headers_key_placeholder">Header name</string>
+    <string name="settings_custom_headers_value_placeholder">Header value</string>
+    <string name="settings_custom_headers_add">Add header</string>
+    <string name="settings_custom_headers_remove">Remove header</string>
 
     <!-- Display settings section -->
     <string name="settings_display_title">Display Settings</string>