diff --git a/pkg/services/ngalert/api/lotex_am.go b/pkg/services/ngalert/api/lotex_am.go
index d78eb536ba5..f1bff2af68f 100644
--- a/pkg/services/ngalert/api/lotex_am.go
+++ b/pkg/services/ngalert/api/lotex_am.go
@@ -25,6 +25,14 @@ var endpoints = map[string]map[string]string{
 		"alerts":   "/alertmanager/api/v2/alerts",
 		"config":   "/api/v1/alerts",
 	},
+	"mimir": {
+		"silences": "/alertmanager/api/v2/silences",
+		"silence":  "/alertmanager/api/v2/silence/%s",
+		"status":   "/alertmanager/api/v2/status",
+		"groups":   "/alertmanager/api/v2/alerts/groups",
+		"alerts":   "/alertmanager/api/v2/alerts",
+		"config":   "/api/v1/alerts",
+	},
 	"prometheus": {
 		"silences": "/api/v2/silences",
 		"silence":  "/api/v2/silence/%s",
diff --git a/public/app/plugins/datasource/alertmanager/ConfigEditor.tsx b/public/app/plugins/datasource/alertmanager/ConfigEditor.tsx
index fdb4710782e..f7099e80f1f 100644
--- a/public/app/plugins/datasource/alertmanager/ConfigEditor.tsx
+++ b/public/app/plugins/datasource/alertmanager/ConfigEditor.tsx
@@ -8,6 +8,12 @@ import { AlertManagerDataSourceJsonData, AlertManagerImplementation } from './ty
 export type Props = DataSourcePluginOptionsEditorProps<AlertManagerDataSourceJsonData>;
 
 const IMPL_OPTIONS: SelectableValue[] = [
+  {
+    value: AlertManagerImplementation.mimir,
+    icon: 'public/img/alerting/mimir_logo.svg',
+    label: 'Mimir',
+    description: `https://grafana.com/oss/mimir/. An open source, horizontally scalable, highly available, multi-tenant, long-term storage for Prometheus.`,
+  },
   {
     value: AlertManagerImplementation.cortex,
     label: 'Cortex',
@@ -32,7 +38,7 @@ export const ConfigEditor: React.FC<Props> = ({ options, onOptionsChange }) => {
             <Select
               width={40}
               options={IMPL_OPTIONS}
-              value={options.jsonData.implementation || AlertManagerImplementation.cortex}
+              value={options.jsonData.implementation || AlertManagerImplementation.mimir}
               onChange={(value) =>
                 onOptionsChange({
                   ...options,
diff --git a/public/app/plugins/datasource/alertmanager/DataSource.ts b/public/app/plugins/datasource/alertmanager/DataSource.ts
index e091184a458..5616ac4ab51 100644
--- a/public/app/plugins/datasource/alertmanager/DataSource.ts
+++ b/public/app/plugins/datasource/alertmanager/DataSource.ts
@@ -51,7 +51,7 @@ export class AlertManagerDatasource extends DataSourceApi<AlertManagerQuery, Ale
           return {
             status: 'error',
             message:
-              'It looks like you have chosen Prometheus implementation, but detected a Cortex endpoint. Please update implementation selection and try again.',
+              'It looks like you have chosen Prometheus implementation, but detected a Mimir or Cortex endpoint. Please update implementation selection and try again.',
           };
         }
       } catch (e) {}
@@ -65,7 +65,7 @@ export class AlertManagerDatasource extends DataSourceApi<AlertManagerQuery, Ale
           return {
             status: 'error',
             message:
-              'It looks like you have chosen Cortex implementation, but detected a Prometheus endpoint. Please update implementation selection and try again.',
+              'It looks like you have chosen a Mimir or Cortex implementation, but detected a Prometheus endpoint. Please update implementation selection and try again.',
           };
         }
       } catch (e) {}
diff --git a/public/app/plugins/datasource/alertmanager/types.ts b/public/app/plugins/datasource/alertmanager/types.ts
index 7c4f195e836..2805072ad78 100644
--- a/public/app/plugins/datasource/alertmanager/types.ts
+++ b/public/app/plugins/datasource/alertmanager/types.ts
@@ -280,6 +280,7 @@ export interface ExternalAlertmanagerConfig {
 
 export enum AlertManagerImplementation {
   cortex = 'cortex',
+  mimir = 'mimir',
   prometheus = 'prometheus',
 }