diff --git a/.changeset/unlucky-geese-give.md b/.changeset/unlucky-geese-give.md
new file mode 100644
index 0000000..fa62f6f
--- /dev/null
+++ b/.changeset/unlucky-geese-give.md
@@ -0,0 +1,5 @@
+---
+'@apollo/datasource-rest': patch
+---
+
+Parse JSON body when Content-Type has charset
diff --git a/src/RESTDataSource.ts b/src/RESTDataSource.ts
index 9246f54..3babd86 100644
--- a/src/RESTDataSource.ts
+++ b/src/RESTDataSource.ts
@@ -303,14 +303,14 @@ export abstract class RESTDataSource<CO extends CacheOptions = CacheOptions> {
   protected parseBody(response: FetcherResponse): Promise<object | string> {
     const contentType = response.headers.get('Content-Type');
     const contentLength = response.headers.get('Content-Length');
+    const mediaType = contentType?.split(';')?.[0];
     if (
       // As one might expect, a "204 No Content" is empty! This means there
       // isn't enough to `JSON.parse`, and trying will result in an error.
       response.status !== 204 &&
       contentLength !== '0' &&
-      contentType &&
-      (contentType.startsWith('application/json') ||
-        contentType.endsWith('+json'))
+      (mediaType?.startsWith('application/json') ||
+        mediaType?.endsWith('+json'))
     ) {
       return response.json();
     } else {
diff --git a/src/__tests__/RESTDataSource.test.ts b/src/__tests__/RESTDataSource.test.ts
index f3e7cda..4652c29 100644
--- a/src/__tests__/RESTDataSource.test.ts
+++ b/src/__tests__/RESTDataSource.test.ts
@@ -784,6 +784,51 @@ describe('RESTDataSource', () => {
         expect(data).toEqual({ foo: 'bar' });
       });
 
+      it('returns data as parsed JSON when Content-Type ends in +json and has charset provided', async () => {
+        const dataSource = new (class extends RESTDataSource {
+          override baseURL = 'https://api.example.com';
+
+          getFoo() {
+            return this.get('foo');
+          }
+        })();
+
+        nock(apiUrl)
+          .get('/foo')
+          .reply(
+            200,
+            { foo: 'bar' },
+            { 'content-type': 'application/vnd.api+json; charset=utf-8' },
+          );
+
+        const data = await dataSource.getFoo();
+
+        expect(data).toEqual({ foo: 'bar' });
+      });
+
+      it('returns data as parsed JSON when Content-Type ends in +json and has many parameters provided', async () => {
+        const dataSource = new (class extends RESTDataSource {
+          override baseURL = 'https://api.example.com';
+
+          getFoo() {
+            return this.get('foo');
+          }
+        })();
+
+        nock(apiUrl).get('/foo').reply(
+          200,
+          { foo: 'bar' },
+          {
+            'content-type':
+              'application/vnd.api+json; charset=utf-8; boundary=ExampleBoundaryString',
+          },
+        );
+
+        const data = await dataSource.getFoo();
+
+        expect(data).toEqual({ foo: 'bar' });
+      });
+
       it('returns data as a string when Content-Type is text/plain', async () => {
         const dataSource = new (class extends RESTDataSource {
           override baseURL = 'https://api.example.com';