diff --git a/src/components/BehaviorCatalog.tsx b/src/components/BehaviorCatalog.tsx
index 5e75744..bdeb049 100644
--- a/src/components/BehaviorCatalog.tsx
+++ b/src/components/BehaviorCatalog.tsx
@@ -6,6 +6,7 @@ import { BehaviorCard } from "./BehaviorCard";
 import type { Behavior } from "@registry/schema/behavior";
 import { DuckMark } from "./DuckMark";
 import { QuackButton } from "./QuackAction";
+import { formatRobotdSlot } from "@/lib/labels";
 
 interface BehaviorCatalogProps {
   initialBehaviors: Behavior[];
@@ -16,10 +17,16 @@ export function BehaviorCatalog({ initialBehaviors }: BehaviorCatalogProps) {
   const [category, setCategory] = useState("all");
   const [verification, setVerification] = useState("all");
   const [accessory, setAccessory] = useState("all");
+  const [slot, setSlot] = useState("all");
+
+  const slots = useMemo(() => Array.from(new Set(initialBehaviors.map((behavior) => behavior.compatibility.robotd_slot)))
+    .sort((a, b) => formatRobotdSlot(a).localeCompare(formatRobotdSlot(b)))
+    .map((id) => ({ id, label: formatRobotdSlot(id) })), [initialBehaviors]);
 
   const filteredBehaviors = useMemo(() => initialBehaviors.filter((behavior) => {
     if (category !== "all" && behavior.category !== category) return false;
     if (verification !== "all" && behavior.verification.status !== verification) return false;
+    if (slot !== "all" && behavior.compatibility.robotd_slot !== slot) return false;
 
     if (accessory === "none" && behavior.compatibility.accessories_required.length > 0) return false;
     if (accessory !== "all" && accessory !== "none" && !behavior.compatibility.accessories_required.includes(accessory)) return false;
@@ -35,15 +42,17 @@ export function BehaviorCatalog({ initialBehaviors }: BehaviorCatalogProps) {
       behavior.sources.task_id || "",
       behavior.category,
       behavior.verification.status,
+      behavior.compatibility.robotd_slot,
       ...behavior.compatibility.accessories_required,
     ].some((value) => value.toLowerCase().includes(query));
-  }), [accessory, category, initialBehaviors, search, verification]);
+  }), [accessory, category, initialBehaviors, search, slot, verification]);
 
   const resetFilters = () => {
     setSearch("");
     setCategory("all");
     setVerification("all");
     setAccessory("all");
+    setSlot("all");
   };
 
   return (
@@ -58,6 +67,9 @@ export function BehaviorCatalog({ initialBehaviors }: BehaviorCatalogProps) {
           setSelectedVerification={setVerification}
           selectedAccessory={accessory}
           setSelectedAccessory={setAccessory}
+          selectedSlot={slot}
+          setSelectedSlot={setSlot}
+          slots={slots}
           totalCount={initialBehaviors.length}
           filteredCount={filteredBehaviors.length}
         />
diff --git a/src/components/FilterBar.tsx b/src/components/FilterBar.tsx
index f9cf1f7..cb72b4a 100644
--- a/src/components/FilterBar.tsx
+++ b/src/components/FilterBar.tsx
@@ -11,6 +11,9 @@ interface FilterBarProps {
   setSelectedVerification: (v: string) => void;
   selectedAccessory: string;
   setSelectedAccessory: (a: string) => void;
+  selectedSlot: string;
+  setSelectedSlot: (s: string) => void;
+  slots: Array<{ id: string; label: string }>;
   totalCount: number;
   filteredCount: number;
 }
@@ -48,6 +51,9 @@ export function FilterBar({
   setSelectedVerification,
   selectedAccessory,
   setSelectedAccessory,
+  selectedSlot,
+  setSelectedSlot,
+  slots,
   totalCount,
   filteredCount,
 }: FilterBarProps) {
@@ -55,13 +61,15 @@ export function FilterBar({
     search.trim() !== "" ||
     selectedCategory !== "all" ||
     selectedVerification !== "all" ||
-    selectedAccessory !== "all";
+    selectedAccessory !== "all" ||
+    selectedSlot !== "all";
 
   const clearAllFilters = () => {
     setSearch("");
     setSelectedCategory("all");
     setSelectedVerification("all");
     setSelectedAccessory("all");
+    setSelectedSlot("all");
   };
 
   return (
@@ -104,6 +112,13 @@ export function FilterBar({
             {accessories.map((item) => <option key={item.id} value={item.id}>{item.label}</option>)}
           </select>
         </label>
+        <label htmlFor="slot-filter">
+          <span className="sr-only">Robotd slot</span>
+          <select id="slot-filter" className="filter-select" value={selectedSlot} onChange={(event) => setSelectedSlot(event.target.value)} aria-label="Filter by robotd slot">
+            <option value="all">Any slot</option>
+            {slots.map((item) => <option key={item.id} value={item.id}>{item.label}</option>)}
+          </select>
+        </label>
         <div className="filter-count" aria-live="polite">
           <strong>{filteredCount}</strong> of {totalCount}
           {hasActiveFilters && <button type="button" className="reset-link" onClick={clearAllFilters}>Reset</button>}
diff --git a/src/lib/labels.ts b/src/lib/labels.ts
index 09f8658..d63bdad 100644
--- a/src/lib/labels.ts
+++ b/src/lib/labels.ts
@@ -1,4 +1,4 @@
-import type { BehaviorCategory } from "@registry/schema/behavior";
+import type { BehaviorCategory, RobotDSlot } from "@registry/schema/behavior";
 
 const categoryLabels: Record<BehaviorCategory, string> = {
   locomotion: "Locomotion",
@@ -9,6 +9,18 @@ const categoryLabels: Record<BehaviorCategory, string> = {
   experimental: "Experimental",
 };
 
+const robotdSlotLabels: Record<RobotDSlot, string> = {
+  walk: "Walk",
+  stand: "Stand",
+  sitstand: "Sit ↔ stand",
+  roulade: "Roulade",
+  kick_left: "Kick left",
+  kick_right: "Kick right",
+  ground_pick: "Ground pick",
+  roller: "Roller mode",
+  custom: "Custom",
+};
+
 export function formatCategory(category: BehaviorCategory) {
   return categoryLabels[category] ?? category;
 }
@@ -21,3 +33,7 @@ export function formatAccessory(accessory: string) {
 
   return labels[accessory] ?? accessory.replaceAll("_", " ");
 }
+
+export function formatRobotdSlot(slot: RobotDSlot) {
+  return robotdSlotLabels[slot];
+}