diff --git a/public/app/features/alerting/unified/components/notification-policies/EditDefaultPolicyForm.test.tsx b/public/app/features/alerting/unified/components/notification-policies/EditDefaultPolicyForm.test.tsx
index 6203fe440dd..e6e046c66b0 100644
--- a/public/app/features/alerting/unified/components/notification-policies/EditDefaultPolicyForm.test.tsx
+++ b/public/app/features/alerting/unified/components/notification-policies/EditDefaultPolicyForm.test.tsx
@@ -78,6 +78,32 @@ describe('EditDefaultPolicyForm', function () {
     });
   });
 
+  it('should show an error if repeat interval is lower than group interval', async function () {
+    const user = userEvent.setup();
+
+    const onSubmit = jest.fn();
+    renderRouteForm(
+      {
+        id: '0',
+        receiver: 'default',
+      },
+      [{ value: 'default', label: 'Default' }],
+      onSubmit
+    );
+
+    await user.click(ui.timingOptionsBtn.get());
+
+    await user.type(ui.groupWaitInput.get(), '5m25s');
+    await user.type(ui.groupIntervalInput.get(), '35m40s');
+    await user.type(ui.repeatIntervalInput.get(), '30m');
+
+    await user.click(ui.submitBtn.get());
+
+    expect(ui.error.getAll()).toHaveLength(1);
+    expect(ui.error.get().textContent).toBe('Repeat interval should be higher or equal to Group interval');
+    expect(onSubmit).not.toHaveBeenCalled();
+  });
+
   it('should allow resetting existing timing options', async function () {
     const user = userEvent.setup();
 
diff --git a/public/app/features/alerting/unified/components/notification-policies/EditDefaultPolicyForm.tsx b/public/app/features/alerting/unified/components/notification-policies/EditDefaultPolicyForm.tsx
index 192299b12ad..1812ad8bbb9 100644
--- a/public/app/features/alerting/unified/components/notification-policies/EditDefaultPolicyForm.tsx
+++ b/public/app/features/alerting/unified/components/notification-policies/EditDefaultPolicyForm.tsx
@@ -10,6 +10,7 @@ import {
   mapMultiSelectValueToStrings,
   mapSelectValueToString,
   promDurationValidator,
+  repeatIntervalValidator,
   stringsToSelectableValues,
   stringToSelectableValue,
 } from '../../utils/amroutes';
@@ -43,7 +44,7 @@ export const AmRootRouteForm = ({
 
   return (
     <Form defaultValues={{ ...defaultValues, overrideTimings: true, overrideGrouping: true }} onSubmit={onSubmit}>
-      {({ register, control, errors, setValue }) => (
+      {({ register, control, errors, setValue, getValues }) => (
         <>
           <Field label="Default contact point" invalid={!!errors.receiver} error={errors.receiver?.message}>
             <>
@@ -143,7 +144,12 @@ export const AmRootRouteForm = ({
                 data-testid="am-repeat-interval"
               >
                 <PromDurationInput
-                  {...register('repeatIntervalValue', { validate: promDurationValidator })}
+                  {...register('repeatIntervalValue', {
+                    validate: (value: string) => {
+                      const groupInterval = getValues('groupIntervalValue');
+                      return repeatIntervalValidator(value, groupInterval);
+                    },
+                  })}
                   placeholder={TIMING_OPTIONS_DEFAULTS.repeat_interval}
                   className={styles.promDurationInput}
                   aria-label="Repeat interval"
diff --git a/public/app/features/alerting/unified/components/notification-policies/EditNotificationPolicyForm.test.tsx b/public/app/features/alerting/unified/components/notification-policies/EditNotificationPolicyForm.test.tsx
index b86c7f21097..38856103425 100644
--- a/public/app/features/alerting/unified/components/notification-policies/EditNotificationPolicyForm.test.tsx
+++ b/public/app/features/alerting/unified/components/notification-policies/EditNotificationPolicyForm.test.tsx
@@ -76,6 +76,32 @@ describe('EditNotificationPolicyForm', function () {
     });
   });
 
+  it('should show an error if repeat interval is lower than group interval', async function () {
+    const user = userEvent.setup();
+
+    const onSubmit = jest.fn();
+    renderRouteForm(
+      {
+        id: '1',
+        receiver: 'default',
+      },
+      [{ value: 'default', label: 'Default' }],
+      onSubmit
+    );
+
+    await user.click(ui.overrideTimingsCheckbox.get());
+
+    await user.type(ui.groupWaitInput.get(), '5m25s');
+    await user.type(ui.groupIntervalInput.get(), '35m40s');
+    await user.type(ui.repeatIntervalInput.get(), '30m');
+
+    await user.click(ui.submitBtn.get());
+
+    expect(ui.error.getAll()).toHaveLength(1);
+    expect(ui.error.get().textContent).toBe('Repeat interval should be higher or equal to Group interval');
+    expect(onSubmit).not.toHaveBeenCalled();
+  });
+
   it('should allow resetting existing timing options', async function () {
     const user = userEvent.setup();
 
diff --git a/public/app/features/alerting/unified/components/notification-policies/EditNotificationPolicyForm.tsx b/public/app/features/alerting/unified/components/notification-policies/EditNotificationPolicyForm.tsx
index eff3d4a2c54..2ec875a0fcf 100644
--- a/public/app/features/alerting/unified/components/notification-policies/EditNotificationPolicyForm.tsx
+++ b/public/app/features/alerting/unified/components/notification-policies/EditNotificationPolicyForm.tsx
@@ -32,6 +32,7 @@ import {
   commonGroupByOptions,
   amRouteToFormAmRoute,
   promDurationValidator,
+  repeatIntervalValidator,
 } from '../../utils/amroutes';
 import { AmRouteReceiver } from '../receivers/grafanaAppReceivers/types';
 
@@ -74,7 +75,7 @@ export const AmRoutesExpandedForm = ({
 
   return (
     <Form defaultValues={defaultValues} onSubmit={onSubmit} maxWidth="none">
-      {({ control, register, errors, setValue, watch }) => (
+      {({ control, register, errors, setValue, watch, getValues }) => (
         <>
           <input type="hidden" {...register('id')} />
           {/* @ts-ignore-check: react-hook-form made me do this */}
@@ -247,7 +248,12 @@ export const AmRoutesExpandedForm = ({
                 error={errors.repeatIntervalValue?.message}
               >
                 <PromDurationInput
-                  {...register('repeatIntervalValue', { validate: promDurationValidator })}
+                  {...register('repeatIntervalValue', {
+                    validate: (value: string) => {
+                      const groupInterval = getValues('groupIntervalValue');
+                      return repeatIntervalValidator(value, groupInterval);
+                    },
+                  })}
                   aria-label="Repeat interval value"
                   className={formStyles.promDurationInput}
                 />
diff --git a/public/app/features/alerting/unified/utils/amroutes.ts b/public/app/features/alerting/unified/utils/amroutes.ts
index 7fbb401e007..615ef277049 100644
--- a/public/app/features/alerting/unified/utils/amroutes.ts
+++ b/public/app/features/alerting/unified/utils/amroutes.ts
@@ -3,6 +3,7 @@ import { uniqueId } from 'lodash';
 import { SelectableValue } from '@grafana/data';
 import { MatcherOperator, ObjectMatcher, Route, RouteWithID } from 'app/plugins/datasource/alertmanager/types';
 
+import { safeParseDurationstr } from '../components/rules/EditRuleGroupModal';
 import { FormAmRoute } from '../types/amroutes';
 import { MatcherFieldValue } from '../types/silence-form';
 
@@ -225,3 +226,27 @@ export function promDurationValidator(duration: string) {
 
   return isValidPrometheusDuration(duration) || 'Invalid duration format. Must be {number}{time_unit}';
 }
+
+export const repeatIntervalValidator = (repeatInterval: string, groupInterval: string) => {
+  if (repeatInterval.length === 0) {
+    return true;
+  }
+
+  const validRepeatInterval = promDurationValidator(repeatInterval);
+  const validGroupInterval = promDurationValidator(groupInterval);
+
+  if (validRepeatInterval !== true) {
+    return validRepeatInterval;
+  }
+
+  if (validGroupInterval !== true) {
+    return validGroupInterval;
+  }
+
+  const repeatDuration = safeParseDurationstr(repeatInterval);
+  const groupDuration = safeParseDurationstr(groupInterval);
+
+  const isRepeatLowerThanGroupDuration = groupDuration !== 0 && repeatDuration < groupDuration;
+
+  return isRepeatLowerThanGroupDuration ? 'Repeat interval should be higher or equal to Group interval' : true;
+};