diff --git a/.changeset/agp9-built-in-kotlin.md b/.changeset/agp9-built-in-kotlin.md
new file mode 100644
index 00000000..61c9221c
--- /dev/null
+++ b/.changeset/agp9-built-in-kotlin.md
@@ -0,0 +1,5 @@
+---
+'react-native-bottom-tabs': patch
+---
+
+Fix Android build with AGP 9 built-in Kotlin: skip applying the `kotlin-android` plugin when AGP has already registered the `kotlin` extension
diff --git a/packages/react-native-bottom-tabs/android/build.gradle b/packages/react-native-bottom-tabs/android/build.gradle
index f0892bd0..77350168 100644
--- a/packages/react-native-bottom-tabs/android/build.gradle
+++ b/packages/react-native-bottom-tabs/android/build.gradle
@@ -19,7 +19,14 @@ def isNewArchitectureEnabled() {
 }
 
 apply plugin: "com.android.library"
-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"
+}
+
 apply plugin: "kotlin-kapt"
 
 if (isNewArchitectureEnabled()) {