diff --git a/src/instrumentation.ts b/src/instrumentation.ts
index dcd08ba8f6cc0e..065e8c67713918 100644
--- a/src/instrumentation.ts
+++ b/src/instrumentation.ts
@@ -2,6 +2,43 @@ import * as Sentry from '@sentry/nextjs';
 
 import {tracesSampler} from './tracesSampler';
 
+/**
+ * Filter for suppressing expected runtime MDX compilation errors.
+ * These occur when serverless functions attempt to compile MDX at runtime
+ * because source files are excluded from the bundle to stay under Vercel's 250MB limit.
+ * This is an infrastructure edge case that's already handled gracefully by returning 404.
+ * See: app/[[...path]]/page.tsx for graceful error handling.
+ */
+function isExpectedMdxRuntimeError(event: Sentry.ErrorEvent): boolean {
+  const exception = event.exception?.values?.[0];
+  if (!exception) return false;
+
+  const errorMessage = exception.value || '';
+  const errorCode = (exception.mechanism?.data as Record<string, unknown>)?.code ||
+    (exception as Record<string, unknown>).code;
+
+  // Filter errors related to missing MDX files at runtime
+  const isMdxRuntimeError =
+    errorCode === 'MDX_RUNTIME_ERROR' ||
+    (errorCode === 'ENOENT' && errorMessage.includes('Failed to find a valid source file'));
+
+  // Filter errors from attempting to compile MDX when files aren't in bundle
+  const isMdxCompilationError = errorMessage.includes(
+    'Failed to find a valid source file for slug'
+  );
+
+  return isMdxRuntimeError || isMdxCompilationError;
+}
+
+function beforeSendEvent(event: Sentry.ErrorEvent) {
+  if (isExpectedMdxRuntimeError(event)) {
+    // Suppress this error from being reported to Sentry.
+    // The error is handled gracefully in page.tsx with notFound() response.
+    return null;
+  }
+  return event;
+}
+
 export function register() {
   if (process.env.NEXT_RUNTIME === 'nodejs') {
     Sentry.init({
@@ -12,6 +49,7 @@ export function register() {
       environment: process.env.NODE_ENV === 'development' ? 'development' : undefined,
       spotlight: process.env.NODE_ENV === 'development',
       integrations: [Sentry.consoleLoggingIntegration()],
+      beforeSendEvent,
 
       // Filter sensitive metric attributes (no PII in metrics)
       beforeSendMetric: metric => {
@@ -36,6 +74,7 @@ export function register() {
       debug: false,
       environment: process.env.NODE_ENV === 'development' ? 'development' : undefined,
       integrations: [Sentry.consoleLoggingIntegration()],
+      beforeSendEvent,
 
       // Filter sensitive metric attributes (no PII in metrics)
       beforeSendMetric: metric => {