diff --git a/packages/rtk-query-codegen-openapi/src/generate.ts b/packages/rtk-query-codegen-openapi/src/generate.ts
index 123c0433c9..646d3a72c3 100644
--- a/packages/rtk-query-codegen-openapi/src/generate.ts
+++ b/packages/rtk-query-codegen-openapi/src/generate.ts
@@ -262,7 +262,24 @@ export async function generateApi(
       const isPureSnakeCase = /^[a-zA-Z][\\w]*$/.test(param.name);
       const camelCaseName = camelCase(param.name);
 
-      const name = isPureSnakeCase && !allNames.includes(camelCaseName) ? camelCaseName : param.name;
+      let name = isPureSnakeCase && !allNames.includes(camelCaseName) ? camelCaseName : param.name;
+
+      if (name in queryArg) {
+        let duplicatedNewName = `${queryArg[name].param?.in}_${name}`
+        duplicatedNewName = isPureSnakeCase && !allNames.includes(duplicatedNewName) ? camelCase(duplicatedNewName) : duplicatedNewName
+        while (duplicatedNewName in queryArg) {
+          duplicatedNewName = '_' + duplicatedNewName;
+        }
+        queryArg[duplicatedNewName] = queryArg[name]
+        queryArg[duplicatedNewName].name = duplicatedNewName
+        delete queryArg[name]
+
+        name = `${param.in}_${name}`
+        name = isPureSnakeCase && !allNames.includes(name) ? camelCase(name) : name;
+      }
+      while (name in queryArg) {
+        name = '_' + name;
+      }
 
       queryArg[name] = {
         origin: 'param',
@@ -479,6 +496,7 @@ type QueryArgDefinition = {
   originalName: string;
   type: ts.TypeNode;
   required?: boolean;
+  param?: OpenAPIV3.ParameterObject
 } & (
   | {
       origin: 'param';
diff --git a/packages/rtk-query-codegen-openapi/test/__snapshots__/generateEndpoints.test.ts.snap b/packages/rtk-query-codegen-openapi/test/__snapshots__/generateEndpoints.test.ts.snap
index 1f01cf2155..6d7e9e5fb7 100644
--- a/packages/rtk-query-codegen-openapi/test/__snapshots__/generateEndpoints.test.ts.snap
+++ b/packages/rtk-query-codegen-openapi/test/__snapshots__/generateEndpoints.test.ts.snap
@@ -263,6 +263,39 @@ export type User = {
 
 `;
 
+exports[`duplicate parameter names must be prefixed with a path or query prefix 1`] = `
+import { api } from './fixtures/emptyApi';
+const injectedRtkApi = api.injectEndpoints({
+  endpoints: (build) => ({
+    patchApiV1ListByItemId: build.mutation<PatchApiV1ListByItemIdApiResponse, PatchApiV1ListByItemIdApiArg>({
+      query: (queryArg) => ({
+        url: \`/api/v1/list/\${queryArg['item.id']}\`,
+        method: 'PATCH',
+      }),
+    }),
+    patchApiV2BySomeName: build.mutation<PatchApiV2BySomeNameApiResponse, PatchApiV2BySomeNameApiArg>({
+      query: (queryArg) => ({
+        url: \`/api/v2/\${queryArg.pathSomeName}\`,
+        method: 'PATCH',
+        params: { some_name: queryArg.querySomeName },
+      }),
+    }),
+  }),
+  overrideExisting: false,
+});
+export { injectedRtkApi as enhancedApi };
+export type PatchApiV1ListByItemIdApiResponse = /** status 200 A successful response. */ string;
+export type PatchApiV1ListByItemIdApiArg = {
+  'item.id': string;
+};
+export type PatchApiV2BySomeNameApiResponse = /** status 200 A successful response. */ string;
+export type PatchApiV2BySomeNameApiArg = {
+  pathSomeName: string;
+  querySomeName: string;
+};
+
+`;
+
 exports[`endpoint filtering: should only have endpoints loginUser, placeOrder, getOrderById, deleteOrder 1`] = `
 import { api } from './fixtures/emptyApi';
 const injectedRtkApi = api.injectEndpoints({
@@ -434,6 +467,13 @@ const injectedRtkApi = api.injectEndpoints({
         method: 'PATCH',
       }),
     }),
+    patchApiV2BySomeName: build.mutation<PatchApiV2BySomeNameApiResponse, PatchApiV2BySomeNameApiArg>({
+      query: (queryArg) => ({
+        url: \`/api/v2/\${queryArg.pathSomeName}\`,
+        method: 'PATCH',
+        params: { some_name: queryArg.querySomeName },
+      }),
+    }),
   }),
   overrideExisting: false,
 });
@@ -442,6 +482,11 @@ export type PatchApiV1ListByItemIdApiResponse = /** status 200 A successful resp
 export type PatchApiV1ListByItemIdApiArg = {
   'item.id': string;
 };
+export type PatchApiV2BySomeNameApiResponse = /** status 200 A successful response. */ string;
+export type PatchApiV2BySomeNameApiArg = {
+  pathSomeName: string;
+  querySomeName: string;
+};
 
 `;
 
diff --git a/packages/rtk-query-codegen-openapi/test/fixtures/params.json b/packages/rtk-query-codegen-openapi/test/fixtures/params.json
index 5a97d8984e..8b078860cf 100644
--- a/packages/rtk-query-codegen-openapi/test/fixtures/params.json
+++ b/packages/rtk-query-codegen-openapi/test/fixtures/params.json
@@ -27,6 +27,32 @@
           }
         ]
       }
+    },
+    "/api/v2/{some_name}": {
+      "patch": {
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "type": "string"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "some_name",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "some_name",
+            "in": "query",
+            "required": true,
+            "type": "string"
+          }
+        ]
+      }
     }
   }
 }
diff --git a/packages/rtk-query-codegen-openapi/test/generateEndpoints.test.ts b/packages/rtk-query-codegen-openapi/test/generateEndpoints.test.ts
index 01585dc291..51ed80db41 100644
--- a/packages/rtk-query-codegen-openapi/test/generateEndpoints.test.ts
+++ b/packages/rtk-query-codegen-openapi/test/generateEndpoints.test.ts
@@ -229,6 +229,18 @@ test('should use brackets in a querystring urls arg, when the arg contains full
   expect(api).toMatchSnapshot();
 });
 
+test('duplicate parameter names must be prefixed with a path or query prefix', async () => {
+  const api = await generateEndpoints({
+    unionUndefined: true,
+    apiFile: './fixtures/emptyApi.ts',
+    schemaFile: resolve(__dirname, 'fixtures/params.json'),
+  });
+  // eslint-disable-next-line no-template-curly-in-string
+  expect(api).toContain('pathSomeName: string');
+  expect(api).toContain('querySomeName: string');
+  expect(api).toMatchSnapshot();
+});
+
 test('apiImport builds correct `import` statement', async () => {
   const api = await generateEndpoints({
     unionUndefined: true,