diff --git a/.chronus/changes/http-specs_remove-discriminated-union-2025-2-13-10-42-35.md b/.chronus/changes/http-specs_remove-discriminated-union-2025-2-13-10-42-35.md
new file mode 100644
index 00000000000..5180c568166
--- /dev/null
+++ b/.chronus/changes/http-specs_remove-discriminated-union-2025-2-13-10-42-35.md
@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-specs"
+---
+
+Remove SpreadRecordForDiscriminatedUnion case
\ No newline at end of file
diff --git a/packages/http-client-js/test/e2e/http/type/property/additional-properties/spreads.test.ts b/packages/http-client-js/test/e2e/http/type/property/additional-properties/spreads.test.ts
index 72ac24a2059..a7c742a6c76 100644
--- a/packages/http-client-js/test/e2e/http/type/property/additional-properties/spreads.test.ts
+++ b/packages/http-client-js/test/e2e/http/type/property/additional-properties/spreads.test.ts
@@ -20,8 +20,6 @@ import {
   SpreadFloatClient,
   SpreadModelArrayClient,
   SpreadModelClient,
-  SpreadRecordDiscriminatedUnionClient,
-  SpreadRecordForDiscriminatedUnion,
   SpreadRecordForNonDiscriminatedUnion,
   SpreadRecordForNonDiscriminatedUnion2,
   SpreadRecordForNonDiscriminatedUnion3,
@@ -377,31 +375,6 @@ describe("Missing AdditionalProperties Endpoints", () => {
     });
   });
 
-  /**
-   * Deprecated @discriminator in unions
-   */
-  describe.skip("SpreadRecordDiscriminatedUnion", () => {
-    const client = new SpreadRecordDiscriminatedUnionClient(clientOptions);
-    const expected: SpreadRecordForDiscriminatedUnion = {
-      name: "abc",
-      additionalProperties: {
-        prop1: { kind: "kind0", fooProp: "abc" },
-        prop2: {
-          kind: "kind1",
-          start: new Date("2021-01-01T00:00:00Z"),
-          end: new Date("2021-01-02T00:00:00Z"),
-        },
-      },
-    };
-    it("GET returns the expected response", async () => {
-      const response = await client.get();
-      expect(response).toEqual(expected);
-    });
-    it("PUT accepts the expected input", async () => {
-      await client.put(expected);
-    });
-  });
-
   describe("SpreadRecordNonDiscriminatedUnion", () => {
     const client = new SpreadRecordNonDiscriminatedUnionClient(clientOptions);
     const expected: SpreadRecordForNonDiscriminatedUnion = {
diff --git a/packages/http-specs/spec-summary.md b/packages/http-specs/spec-summary.md
index 9a6a4fd23cf..16afccf10a3 100644
--- a/packages/http-specs/spec-summary.md
+++ b/packages/http-specs/spec-summary.md
@@ -5336,42 +5336,6 @@ Expected input body:
 }
 ```
 
-### Type_Property_AdditionalProperties_SpreadRecordDiscriminatedUnion_get
-
-- Endpoint: `get /type/property/additionalProperties/spreadRecordDiscriminatedUnion`
-
-Expected response body:
-
-```json
-{
-  "name": "abc",
-  "prop1": { "kind": "kind0", "fooProp": "abc" },
-  "prop2": {
-    "kind": "kind1",
-    "start": "2021-01-01T00:00:00Z",
-    "end": "2021-01-02T00:00:00Z"
-  }
-}
-```
-
-### Type_Property_AdditionalProperties_SpreadRecordDiscriminatedUnion_put
-
-- Endpoint: `put /type/property/additionalProperties/spreadRecordDiscriminatedUnion`
-
-Expected input body:
-
-```json
-{
-  "name": "abc",
-  "prop1": { "kind": "kind0", "fooProp": "abc" },
-  "prop2": {
-    "kind": "kind1",
-    "start": "2021-01-01T00:00:00Z",
-    "end": "2021-01-02T00:00:00Z"
-  }
-}
-```
-
 ### Type_Property_AdditionalProperties_SpreadRecordNonDiscriminatedUnion_get
 
 - Endpoint: `get /type/property/additionalProperties/spreadRecordNonDiscriminatedUnion`
diff --git a/packages/http-specs/specs/type/property/additional-properties/main.tsp b/packages/http-specs/specs/type/property/additional-properties/main.tsp
index a9132e3042c..b304f1db348 100644
--- a/packages/http-specs/specs/type/property/additional-properties/main.tsp
+++ b/packages/http-specs/specs/type/property/additional-properties/main.tsp
@@ -463,17 +463,19 @@ interface SpreadRecordUnion
     > {}
 
 // ****************** spread record of discriminated unions **************************
-@discriminated(#{ envelope: "none" })
-union WidgetData {
-  kind0: WidgetData0,
-  kind1: WidgetData1,
-}
+// @discriminated(#{ envelope: "none" })
+// union WidgetData {
+//   kind0: WidgetData0,
+//   kind1: WidgetData1,
+// }
 
 model WidgetData0 {
+  kind: "kind0";
   fooProp: string;
 }
 
 model WidgetData1 {
+  kind: "kind1";
   start: utcDateTime;
   end?: utcDateTime;
 }
@@ -483,20 +485,20 @@ model WidgetData2 {
   start: string;
 }
 
-@doc("The model spread Record<WidgetData>")
-model SpreadRecordForDiscriminatedUnion {
-  @doc("The name property")
-  name: string;
+// @doc("The model spread Record<WidgetData>")
+// model SpreadRecordForDiscriminatedUnion {
+//   @doc("The name property")
+//   name: string;
 
-  ...Record<WidgetData>;
-}
+//   ...Record<WidgetData>;
+// }
 
-@route("/spreadRecordDiscriminatedUnion")
-interface SpreadRecordDiscriminatedUnion
-  extends ModelOperations<
-      SpreadRecordForDiscriminatedUnion,
-      "{'name': 'abc', 'prop1': {'kind': 'kind0', 'fooProp': 'abc'}, 'prop2': {'kind': 'kind1', 'start': '2021-01-01T00:00:00Z', 'end': '2021-01-02T00:00:00Z'}}"
-    > {}
+// @route("/spreadRecordDiscriminatedUnion")
+// interface SpreadRecordDiscriminatedUnion
+//   extends ModelOperations<
+//       SpreadRecordForDiscriminatedUnion,
+//       "{'name': 'abc', 'prop1': {'kind': 'kind0', 'fooProp': 'abc'}, 'prop2': {'kind': 'kind1', 'start': '2021-01-01T00:00:00Z', 'end': '2021-01-02T00:00:00Z'}}"
+//     > {}
 
 // ****************** spread record of non-discriminated unions but could guess a discriminator **************************
 @doc("The model spread Record<WidgetData0 | WidgetData1>")
diff --git a/packages/http-specs/specs/type/property/additional-properties/mockapi.ts b/packages/http-specs/specs/type/property/additional-properties/mockapi.ts
index 8ecc675cc67..cf971448633 100644
--- a/packages/http-specs/specs/type/property/additional-properties/mockapi.ts
+++ b/packages/http-specs/specs/type/property/additional-properties/mockapi.ts
@@ -432,14 +432,14 @@ Scenarios.Type_Property_AdditionalProperties_SpreadRecordUnion_get =
 Scenarios.Type_Property_AdditionalProperties_SpreadRecordUnion_put =
   Type_Property_Additional_Properties_Spread_Record_Union.put;
 
-const Type_Property_Additional_Properties_Spread_Record_Discriminated_Union = createServerTests(
-  `/type/property/additionalProperties/spreadRecordDiscriminatedUnion`,
-  recordDiscriminatedUnionBody,
-);
-Scenarios.Type_Property_AdditionalProperties_SpreadRecordDiscriminatedUnion_get =
-  Type_Property_Additional_Properties_Spread_Record_Discriminated_Union.get;
-Scenarios.Type_Property_AdditionalProperties_SpreadRecordDiscriminatedUnion_put =
-  Type_Property_Additional_Properties_Spread_Record_Discriminated_Union.put;
+// const Type_Property_Additional_Properties_Spread_Record_Discriminated_Union = createServerTests(
+//   `/type/property/additionalProperties/spreadRecordDiscriminatedUnion`,
+//   recordDiscriminatedUnionBody,
+// );
+// Scenarios.Type_Property_AdditionalProperties_SpreadRecordDiscriminatedUnion_get =
+//   Type_Property_Additional_Properties_Spread_Record_Discriminated_Union.get;
+// Scenarios.Type_Property_AdditionalProperties_SpreadRecordDiscriminatedUnion_put =
+//   Type_Property_Additional_Properties_Spread_Record_Discriminated_Union.put;
 
 const Type_Property_Additional_Properties_Spread_Record_Non_Discriminated_Union = createServerTests(
   `/type/property/additionalProperties/spreadRecordNonDiscriminatedUnion`,