diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92a81f5a510..f309e7d252d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Fixes
+
+- Do not override user-defined `SentryOptions` ([#4262](https://github.com/getsentry/sentry-java/pull/4262))
+
 ## 8.5.0
 
 ### Features
diff --git a/sentry-android-core/src/main/java/io/sentry/android/core/AndroidOptionsInitializer.java b/sentry-android-core/src/main/java/io/sentry/android/core/AndroidOptionsInitializer.java
index 6465381a8ea..f70ea73b0fe 100644
--- a/sentry-android-core/src/main/java/io/sentry/android/core/AndroidOptionsInitializer.java
+++ b/sentry-android-core/src/main/java/io/sentry/android/core/AndroidOptionsInitializer.java
@@ -11,6 +11,7 @@
 import io.sentry.ILogger;
 import io.sentry.ISentryLifecycleToken;
 import io.sentry.ITransactionProfiler;
+import io.sentry.NoOpCompositePerformanceCollector;
 import io.sentry.NoOpConnectionStatusProvider;
 import io.sentry.NoOpContinuousProfiler;
 import io.sentry.NoOpTransactionProfiler;
@@ -35,12 +36,16 @@
 import io.sentry.cache.PersistingScopeObserver;
 import io.sentry.compose.gestures.ComposeGestureTargetLocator;
 import io.sentry.compose.viewhierarchy.ComposeViewHierarchyExporter;
+import io.sentry.internal.debugmeta.NoOpDebugMetaLoader;
 import io.sentry.internal.gestures.GestureTargetLocator;
+import io.sentry.internal.modules.NoOpModulesLoader;
 import io.sentry.internal.viewhierarchy.ViewHierarchyExporter;
 import io.sentry.transport.CurrentDateProvider;
 import io.sentry.transport.NoOpEnvelopeCache;
+import io.sentry.transport.NoOpTransportGate;
 import io.sentry.util.LazyEvaluator;
 import io.sentry.util.Objects;
+import io.sentry.util.thread.NoOpThreadChecker;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
@@ -163,7 +168,9 @@ static void initializeIntegrationsAndProcessors(
     options.addEventProcessor(new ScreenshotEventProcessor(options, buildInfoProvider));
     options.addEventProcessor(new ViewHierarchyEventProcessor(options));
     options.addEventProcessor(new AnrV2EventProcessor(context, options, buildInfoProvider));
-    options.setTransportGate(new AndroidTransportGate(options));
+    if (options.getTransportGate() instanceof NoOpTransportGate) {
+      options.setTransportGate(new AndroidTransportGate(options));
+    }
 
     // Check if the profiler was already instantiated in the app start.
     // We use the Android profiler, that uses a global start/stop api, so we need to preserve the
@@ -185,8 +192,12 @@ static void initializeIntegrationsAndProcessors(
         appStartTransactionProfiler,
         appStartContinuousProfiler);
 
-    options.setModulesLoader(new AssetsModulesLoader(context, options.getLogger()));
-    options.setDebugMetaLoader(new AssetsDebugMetaLoader(context, options.getLogger()));
+    if (options.getModulesLoader() instanceof NoOpModulesLoader) {
+      options.setModulesLoader(new AssetsModulesLoader(context, options.getLogger()));
+    }
+    if (options.getDebugMetaLoader() instanceof NoOpDebugMetaLoader) {
+      options.setDebugMetaLoader(new AssetsDebugMetaLoader(context, options.getLogger()));
+    }
 
     final boolean isAndroidXScrollViewAvailable =
         loadClass.isClassAvailable("androidx.core.view.ScrollingView", options);
@@ -218,7 +229,9 @@ static void initializeIntegrationsAndProcessors(
       options.setViewHierarchyExporters(viewHierarchyExporters);
     }
 
-    options.setThreadChecker(AndroidThreadChecker.getInstance());
+    if (options.getThreadChecker() instanceof NoOpThreadChecker) {
+      options.setThreadChecker(AndroidThreadChecker.getInstance());
+    }
     if (options.getPerformanceCollectors().isEmpty()) {
       options.addPerformanceCollector(new AndroidMemoryCollector());
       options.addPerformanceCollector(new AndroidCpuCollector(options.getLogger()));
@@ -232,7 +245,9 @@ static void initializeIntegrationsAndProcessors(
                     "options.getFrameMetricsCollector is required")));
       }
     }
-    options.setCompositePerformanceCollector(new DefaultCompositePerformanceCollector(options));
+    if (options.getCompositePerformanceCollector() instanceof NoOpCompositePerformanceCollector) {
+      options.setCompositePerformanceCollector(new DefaultCompositePerformanceCollector(options));
+    }
   }
 
   /** Setup the correct profiler (transaction or continuous) based on the options. */
diff --git a/sentry-android-core/src/test/java/io/sentry/android/core/AndroidOptionsInitializerTest.kt b/sentry-android-core/src/test/java/io/sentry/android/core/AndroidOptionsInitializerTest.kt
index 769510479f8..dfc88fa0e78 100644
--- a/sentry-android-core/src/test/java/io/sentry/android/core/AndroidOptionsInitializerTest.kt
+++ b/sentry-android-core/src/test/java/io/sentry/android/core/AndroidOptionsInitializerTest.kt
@@ -6,7 +6,9 @@ import android.os.Build
 import android.os.Bundle
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import io.sentry.CompositePerformanceCollector
 import io.sentry.DefaultCompositePerformanceCollector
+import io.sentry.IConnectionStatusProvider
 import io.sentry.IContinuousProfiler
 import io.sentry.ILogger
 import io.sentry.ITransactionProfiler
@@ -15,17 +17,24 @@ import io.sentry.NoOpContinuousProfiler
 import io.sentry.NoOpTransactionProfiler
 import io.sentry.SentryOptions
 import io.sentry.android.core.cache.AndroidEnvelopeCache
+import io.sentry.android.core.internal.debugmeta.AssetsDebugMetaLoader
 import io.sentry.android.core.internal.gestures.AndroidViewGestureTargetLocator
 import io.sentry.android.core.internal.modules.AssetsModulesLoader
+import io.sentry.android.core.internal.util.AndroidConnectionStatusProvider
 import io.sentry.android.core.internal.util.AndroidThreadChecker
 import io.sentry.android.core.performance.AppStartMetrics
 import io.sentry.android.fragment.FragmentLifecycleIntegration
 import io.sentry.android.replay.ReplayIntegration
 import io.sentry.android.timber.SentryTimberIntegration
+import io.sentry.cache.IEnvelopeCache
 import io.sentry.cache.PersistingOptionsObserver
 import io.sentry.cache.PersistingScopeObserver
 import io.sentry.compose.gestures.ComposeGestureTargetLocator
+import io.sentry.internal.debugmeta.IDebugMetaLoader
+import io.sentry.internal.modules.IModulesLoader
 import io.sentry.test.ImmediateExecutorService
+import io.sentry.transport.ITransportGate
+import io.sentry.util.thread.IThreadChecker
 import org.junit.runner.RunWith
 import org.mockito.kotlin.any
 import org.mockito.kotlin.eq
@@ -840,4 +849,25 @@ class AndroidOptionsInitializerTest {
         fixture.sentryOptions.findPersistingScopeObserver()?.setTags(mapOf("key" to "value"))
         assertFalse(File(AndroidOptionsInitializer.getCacheDir(fixture.context), PersistingScopeObserver.SCOPE_CACHE).exists())
     }
+
+    @Test
+    fun `user options have precedence over defaults`() {
+        fixture.initSut(configureOptions = {
+            setTransportGate(mock<ITransportGate>())
+            setEnvelopeDiskCache(mock<IEnvelopeCache>())
+            connectionStatusProvider = mock<IConnectionStatusProvider>()
+            setModulesLoader(mock<IModulesLoader>())
+            setDebugMetaLoader(mock<IDebugMetaLoader>())
+            threadChecker = mock<IThreadChecker>()
+            compositePerformanceCollector = mock<CompositePerformanceCollector>()
+        })
+
+        assertFalse { fixture.sentryOptions.transportGate is AndroidTransportGate }
+        assertFalse { fixture.sentryOptions.envelopeDiskCache is AndroidEnvelopeCache }
+        assertFalse { fixture.sentryOptions.connectionStatusProvider is AndroidConnectionStatusProvider }
+        assertFalse { fixture.sentryOptions.modulesLoader is AssetsModulesLoader }
+        assertFalse { fixture.sentryOptions.debugMetaLoader is AssetsDebugMetaLoader }
+        assertFalse { fixture.sentryOptions.threadChecker is AndroidThreadChecker }
+        assertFalse { fixture.sentryOptions.compositePerformanceCollector is DefaultCompositePerformanceCollector }
+    }
 }