diff --git a/android/build.gradle b/android/build.gradle
index e90654763..c3e03928b 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -53,7 +53,13 @@ apply plugin: 'com.android.library'
 if (isNewArchitectureEnabled()) {
     apply plugin: 'com.facebook.react'
 }
-apply plugin: 'kotlin-android'
+// AGP 9 ships built-in Kotlin support and registers the `kotlin` extension
+// itself. Applying the Kotlin plugin on top of it fails configuration with
+// "Cannot add extension with name 'kotlin'". Only apply it when nothing has
+// registered that extension yet.
+if (project.extensions.findByName('kotlin') == null) {
+    apply plugin: 'kotlin-android'
+}
 
 android {
     if (supportsNamespace()) {