diff --git a/packages/react-native/Libraries/Network/FormData.js b/packages/react-native/Libraries/Network/FormData.js
index 91735c6b033b19..b237b45ae24344 100644
--- a/packages/react-native/Libraries/Network/FormData.js
+++ b/packages/react-native/Libraries/Network/FormData.js
@@ -28,6 +28,15 @@ type FormDataPart =
       ...
     };
 
+/**
+ * Encode a FormData filename compliant with RFC 2183
+ *
+ * https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition#directives
+ */
+function encodeFilename(filename: string): string {
+  return encodeURIComponent(filename.replace(/\//g, '_'));
+}
+
 /**
  * Polyfill for XMLHttpRequest2 FormData API, allowing multipart POST requests
  * with mixed data (string, native files) to be submitted via XMLHttpRequest.
@@ -82,9 +91,8 @@ class FormData {
       // content type (cf. web Blob interface.)
       if (typeof value === 'object' && !Array.isArray(value) && value) {
         if (typeof value.name === 'string') {
-          headers['content-disposition'] += `; filename="${
-            value.name
-          }"; filename*=utf-8''${encodeURI(value.name)}`;
+          headers['content-disposition'] +=
+            `; filename="${encodeFilename(value.name)}"`;
         }
         if (typeof value.type === 'string') {
           headers['content-type'] = value.type;
diff --git a/packages/react-native/Libraries/Network/__tests__/FormData-test.js b/packages/react-native/Libraries/Network/__tests__/FormData-test.js
index ee741afb7c983b..18830d5f15f3e0 100644
--- a/packages/react-native/Libraries/Network/__tests__/FormData-test.js
+++ b/packages/react-native/Libraries/Network/__tests__/FormData-test.js
@@ -48,8 +48,7 @@ describe('FormData', function () {
       type: 'image/jpeg',
       name: 'photo.jpg',
       headers: {
-        'content-disposition':
-          'form-data; name="photo"; filename="photo.jpg"; filename*=utf-8\'\'photo.jpg',
+        'content-disposition': 'form-data; name="photo"; filename="photo.jpg"',
         'content-type': 'image/jpeg',
       },
       fieldName: 'photo',
@@ -70,7 +69,7 @@ describe('FormData', function () {
       name: '测试photo.jpg',
       headers: {
         'content-disposition':
-          'form-data; name="photo"; filename="测试photo.jpg"; filename*=utf-8\'\'%E6%B5%8B%E8%AF%95photo.jpg',
+          'form-data; name="photo"; filename="%E6%B5%8B%E8%AF%95photo.jpg"',
         'content-type': 'image/jpeg',
       },
       fieldName: 'photo',