diff --git a/.changeset/early-donkeys-join.md b/.changeset/early-donkeys-join.md
new file mode 100644
index 00000000000..2cd079b9108
--- /dev/null
+++ b/.changeset/early-donkeys-join.md
@@ -0,0 +1,5 @@
+---
+'@graphql-tools/executor-graphql-ws': minor
+---
+
+Read and use `connectionParams` from operation extensions
diff --git a/packages/executors/graphql-ws/src/index.ts b/packages/executors/graphql-ws/src/index.ts
index 1d7c95e12e1..acf16622ee9 100644
--- a/packages/executors/graphql-ws/src/index.ts
+++ b/packages/executors/graphql-ws/src/index.ts
@@ -13,12 +13,20 @@ function isClient(client: Client | GraphQLWSExecutorOptions): client is Client {
 
 export function buildGraphQLWSExecutor(clientOptionsOrClient: GraphQLWSExecutorOptions | Client): Executor {
   let graphqlWSClient: Client;
+  let executorConnectionParams = {};
   if (isClient(clientOptionsOrClient)) {
     graphqlWSClient = clientOptionsOrClient;
   } else {
     graphqlWSClient = createClient({
       webSocketImpl: WebSocket,
       lazy: true,
+      connectionParams: () => {
+        const optionsConnectionParams =
+          (typeof clientOptionsOrClient.connectionParams === 'function'
+            ? clientOptionsOrClient.connectionParams()
+            : clientOptionsOrClient.connectionParams) || {};
+        return Object.assign(optionsConnectionParams, executorConnectionParams);
+      },
       ...clientOptionsOrClient,
     });
     if (clientOptionsOrClient.onClient) {
@@ -40,6 +48,11 @@ export function buildGraphQLWSExecutor(clientOptionsOrClient: GraphQLWSExecutorO
       extensions,
       operationType = getOperationASTFromRequest(executionRequest).operation,
     } = executionRequest;
+    // additional connection params can be supplied through the "connectionParams" field in extensions.
+    // TODO: connection params only from the FIRST operation in lazy mode will be used (detect connectionParams changes and reconnect, too implicit?)
+    if (extensions?.['connectionParams'] && typeof extensions?.['connectionParams'] === 'object') {
+      executorConnectionParams = Object.assign(executorConnectionParams, extensions['connectionParams']);
+    }
     const query = print(document);
     const iterableIterator = graphqlWSClient.iterate<TData, TExtensions>({
       query,
diff --git a/packages/executors/legacy-ws/src/index.ts b/packages/executors/legacy-ws/src/index.ts
index 7f9840d096c..88e8a68ab2c 100644
--- a/packages/executors/legacy-ws/src/index.ts
+++ b/packages/executors/legacy-ws/src/index.ts
@@ -16,7 +16,7 @@ export enum LEGACY_WS {
 }
 
 export interface LegacyWSExecutorOpts {
-  connectionParams?: Record<string, any>;
+  connectionParams?: Record<string, unknown> | (() => Record<string, unknown>);
   headers?: Record<string, any>;
 }
 
@@ -25,6 +25,7 @@ export function buildWSLegacyExecutor(
   WebSocketImpl: typeof WebSocket,
   options?: LegacyWSExecutorOpts
 ): Executor {
+  let executorConnectionParams = {};
   let websocket: WebSocket | null = null;
 
   const ensureWebsocket = (errorHandler: (error: Error) => void = err => console.error(err)) => {
@@ -46,6 +47,7 @@ export function buildWSLegacyExecutor(
             payload = options?.connectionParams;
             break;
         }
+        payload = Object.assign(payload, executorConnectionParams);
         websocket!.send(
           JSON.stringify({
             type: LEGACY_WS.CONNECTION_INIT,
@@ -82,6 +84,12 @@ export function buildWSLegacyExecutor(
   };
 
   return function legacyExecutor(request: ExecutionRequest) {
+    // additional connection params can be supplied through the "connectionParams" field in extensions.
+    // TODO: connection params only from the FIRST operation in lazy mode will be used (detect connectionParams changes and reconnect, too implicit?)
+    if (request.extensions?.['connectionParams'] && typeof request.extensions?.['connectionParams'] === 'object') {
+      executorConnectionParams = Object.assign(executorConnectionParams, request.extensions['connectionParams']);
+    }
+
     const id = Date.now().toString();
     return observableToAsyncIterable({
       subscribe(observer) {
diff --git a/packages/loaders/url/src/index.ts b/packages/loaders/url/src/index.ts
index 32317e4df6f..a6225d900fe 100644
--- a/packages/loaders/url/src/index.ts
+++ b/packages/loaders/url/src/index.ts
@@ -91,7 +91,7 @@ export interface LoadFromUrlOptions extends BaseLoaderOptions, Partial<Introspec
   /**
    * Connection Parameters for WebSockets connection
    */
-  connectionParams?: any;
+  connectionParams?: Record<string, unknown> | (() => Record<string, unknown>);
   /**
    * Enable Batching
    */
@@ -154,7 +154,7 @@ export class UrlLoader implements Loader<LoadFromUrlOptions> {
   buildWSExecutor(
     subscriptionsEndpoint: string,
     webSocketImpl: typeof WebSocket,
-    connectionParams?: Record<string, any>
+    connectionParams?: Record<string, unknown> | (() => Record<string, unknown>)
   ): Executor {
     const WS_URL = switchProtocols(subscriptionsEndpoint, {
       https: 'wss',