diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36b6ce2b..1078d410 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ and this project adheres to
 - 🐛(frontend) harden speaker test against missing sinks and play errors
 - 🐛(frontend) implement hysteresis band for the control bar layout
 - 🐛(frontend) fix toolbar ResizeObserver loop and alignment drift
+- 🐛(analytics) filter benign ResizeObserver loop error in Sentry/PostHog
 
 ## [1.26.0] - 2026-08-12
 
diff --git a/src/frontend/src/features/analytics/exceptionFilters.ts b/src/frontend/src/features/analytics/exceptionFilters.ts
new file mode 100644
index 00000000..9a11cfe9
--- /dev/null
+++ b/src/frontend/src/features/analytics/exceptionFilters.ts
@@ -0,0 +1,24 @@
+import type { CaptureResult } from 'posthog-js'
+
+const IGNORED_EXCEPTION_PATTERNS = [
+  /ResizeObserver loop (completed with undelivered notifications|limit exceeded)/,
+]
+
+const shouldIgnoreException = (value: unknown): boolean =>
+  typeof value === 'string' &&
+  IGNORED_EXCEPTION_PATTERNS.some((pattern) => pattern.test(value))
+
+export const filterExceptions = (
+  event: CaptureResult | null
+): CaptureResult | null => {
+  if (event?.event !== '$exception') return event
+
+  const exceptionList = event.properties?.['$exception_list']
+  const values: unknown[] = Array.isArray(exceptionList)
+    ? exceptionList.map((exception) => exception?.value)
+    : []
+
+  values.push(event.properties?.['$exception_message'])
+
+  return values.some(shouldIgnoreException) ? null : event
+}
diff --git a/src/frontend/src/features/analytics/hooks/useAnalytics.ts b/src/frontend/src/features/analytics/hooks/useAnalytics.ts
index a1c2d372..1729bea2 100644
--- a/src/frontend/src/features/analytics/hooks/useAnalytics.ts
+++ b/src/frontend/src/features/analytics/hooks/useAnalytics.ts
@@ -2,6 +2,7 @@ import { useEffect } from 'react'
 import { type ApiUser } from '@/features/auth/api/ApiUser'
 import { useUser } from '@/features/auth/api/useUser'
 import { getPosthog } from '../utils'
+import { filterExceptions } from '../exceptionFilters'
 
 export const startAnalyticsSession = (data: ApiUser) => {
   getPosthog().then((ph) => {
@@ -47,6 +48,7 @@ export const useAnalytics = ({
           capture_unhandled_rejections: true,
           capture_console_errors: true,
         },
+        before_send: filterExceptions,
       })
     })
   }, [id, host, flags_api_host, isDisabled])