diff --git a/app/resources/js/components/admin/ImpersonationBanner.vue b/app/resources/js/components/admin/ImpersonationBanner.vue
new file mode 100644
index 00000000..b4280baf
--- /dev/null
+++ b/app/resources/js/components/admin/ImpersonationBanner.vue
@@ -0,0 +1,84 @@
+<script setup lang="ts">
+/**
+ * Глобальный индикатор активных impersonation-сессий (audit B5 / Ю-1).
+ *
+ * Размещён в AdminLayout над <RouterView> — виден на всех /admin/* страницах.
+ * На MVP saas-admin auth нет и реального переключения сессии нет, поэтому
+ * показываем счётчик ВСЕХ активных сессий (impersonationActive() =
+ * used_at != null AND session_ended_at == null). Polling 30 c — сессия может
+ * стартовать/завершиться, пока админ остаётся в админке (AdminLayout
+ * persistent, перемонтируется только <RouterView>).
+ *
+ * Если активных сессий 0 — компонент не рендерит ничего.
+ */
+import { computed, onMounted, ref } from 'vue';
+import { impersonationActive, type ImpersonationActiveSession } from '../../api/admin';
+import { usePolling } from '../../composables/usePolling';
+
+const sessions = ref<ImpersonationActiveSession[]>([]);
+
+async function load(): Promise<void> {
+    try {
+        sessions.value = await impersonationActive();
+    } catch {
+        // Баннер не критичен — ошибку детально покажет AdminImpersonationView.
+        // Сохраняем прежнее значение sessions, не падаем.
+    }
+}
+
+const count = computed(() => sessions.value.length);
+
+const label = computed(() => {
+    if (count.value === 1) {
+        const s = sessions.value[0];
+        return `Активна impersonation-сессия: ${s.tenant_name ?? `тенант #${s.tenant_id}`}`;
+    }
+    return `Активны impersonation-сессии: ${count.value}`;
+});
+
+onMounted(load);
+usePolling(load, { intervalMs: 30_000 });
+
+defineExpose({ sessions, load });
+</script>
+
+<template>
+    <div v-if="count > 0" class="impersonation-banner" role="status" data-testid="impersonation-banner">
+        <v-icon size="16" class="impersonation-banner__icon">mdi-account-switch</v-icon>
+        <span class="impersonation-banner__label">{{ label }}</span>
+        <RouterLink
+            to="/admin/impersonation"
+            class="impersonation-banner__link"
+            data-testid="impersonation-banner-link"
+        >
+            Открыть
+        </RouterLink>
+    </div>
+</template>
+
+<style scoped>
+.impersonation-banner {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    background: #fff4e0;
+    border-bottom: 1px solid #f0d8a8;
+    color: #8a5a00;
+    font-size: 13px;
+    padding: 8px 24px;
+}
+.impersonation-banner__icon {
+    color: #b87400;
+}
+.impersonation-banner__label {
+    flex: 1;
+}
+.impersonation-banner__link {
+    color: #0f6e56;
+    font-weight: 600;
+    text-decoration: none;
+}
+.impersonation-banner__link:hover {
+    text-decoration: underline;
+}
+</style>
diff --git a/app/resources/js/layouts/AdminLayout.vue b/app/resources/js/layouts/AdminLayout.vue
index 720b15a3..373edc57 100644
--- a/app/resources/js/layouts/AdminLayout.vue
+++ b/app/resources/js/layouts/AdminLayout.vue
@@ -16,6 +16,7 @@ import { useAuthStore } from '../stores/auth';
 import { computed } from 'vue';
 import { RouterView, useRoute, useRouter } from 'vue-router';
 import DevIndexBadge from '../components/DevIndexBadge.vue';
+import ImpersonationBanner from '../components/admin/ImpersonationBanner.vue';
 
 interface NavItem {
     title: string;
@@ -131,6 +132,7 @@ const currentPageTitle = computed(() => {
         </v-app-bar>
 
         <v-main class="admin-main">
+            <ImpersonationBanner />
             <RouterView />
         </v-main>
         <DevIndexBadge :index="route.meta.devIndex" :label="route.meta.devLabel" />
diff --git a/app/tests/Frontend/AdminLayout.spec.ts b/app/tests/Frontend/AdminLayout.spec.ts
index 361c41da..ba2c5402 100644
--- a/app/tests/Frontend/AdminLayout.spec.ts
+++ b/app/tests/Frontend/AdminLayout.spec.ts
@@ -53,7 +53,7 @@ const mountAdminLayout = async (path = '/admin/tenants', user: AuthUser | null =
     const wrapper = mount(AdminLayout, {
         global: {
             plugins: [createVuetify(), router],
-            stubs: { DevIndexBadge: true },
+            stubs: { DevIndexBadge: true, ImpersonationBanner: true },
         },
     });
     return { wrapper, auth, router };
diff --git a/app/tests/Frontend/ImpersonationBanner.spec.ts b/app/tests/Frontend/ImpersonationBanner.spec.ts
new file mode 100644
index 00000000..c9fa67ac
--- /dev/null
+++ b/app/tests/Frontend/ImpersonationBanner.spec.ts
@@ -0,0 +1,118 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { mount, flushPromises } from '@vue/test-utils';
+import { createVuetify } from 'vuetify';
+import ImpersonationBanner from '../../resources/js/components/admin/ImpersonationBanner.vue';
+import type { ImpersonationActiveSession } from '../../resources/js/api/admin';
+
+vi.mock('../../resources/js/api/admin', async (importOriginal) => {
+    const orig = await importOriginal<typeof import('../../resources/js/api/admin')>();
+    return { ...orig, impersonationActive: vi.fn() };
+});
+
+const adminApi = await import('../../resources/js/api/admin');
+
+function makeSession(overrides: Partial<ImpersonationActiveSession> = {}): ImpersonationActiveSession {
+    return {
+        token_id: 1,
+        tenant_id: 10,
+        tenant_name: 'ООО Ромашка',
+        requested_by: 7,
+        reason: 'Диагностика проблемы с балансом по обращению клиента',
+        sent_to_email: 'client@romashka.ru',
+        used_at: '2026-05-16T08:00:00Z',
+        expires_at: '2026-05-16T08:15:00Z',
+        ...overrides,
+    };
+}
+
+const mountBanner = () =>
+    mount(ImpersonationBanner, {
+        global: {
+            plugins: [createVuetify()],
+            stubs: {
+                RouterLink: {
+                    props: ['to'],
+                    inheritAttrs: false,
+                    template: '<a v-bind="$attrs" :href="to"><slot /></a>',
+                },
+            },
+        },
+    });
+
+beforeEach(() => vi.clearAllMocks());
+afterEach(() => vi.useRealTimers());
+
+describe('ImpersonationBanner', () => {
+    it('вызывает impersonationActive на mount', async () => {
+        vi.mocked(adminApi.impersonationActive).mockResolvedValueOnce([]);
+        const wrapper = mountBanner();
+        await flushPromises();
+        expect(adminApi.impersonationActive).toHaveBeenCalledTimes(1);
+        wrapper.unmount();
+    });
+
+    it('0 активных сессий — баннер не рендерится', async () => {
+        vi.mocked(adminApi.impersonationActive).mockResolvedValueOnce([]);
+        const wrapper = mountBanner();
+        await flushPromises();
+        expect(wrapper.find('[data-testid="impersonation-banner"]').exists()).toBe(false);
+        wrapper.unmount();
+    });
+
+    it('1 активная сессия — баннер с именем тенанта + ссылка на /admin/impersonation', async () => {
+        vi.mocked(adminApi.impersonationActive).mockResolvedValueOnce([makeSession({ tenant_name: 'ООО Ромашка' })]);
+        const wrapper = mountBanner();
+        await flushPromises();
+        const banner = wrapper.find('[data-testid="impersonation-banner"]');
+        expect(banner.exists()).toBe(true);
+        expect(banner.text()).toContain('Активна impersonation-сессия');
+        expect(banner.text()).toContain('ООО Ромашка');
+        expect(wrapper.find('[data-testid="impersonation-banner-link"]').attributes('href')).toBe(
+            '/admin/impersonation',
+        );
+        wrapper.unmount();
+    });
+
+    it('несколько активных сессий — баннер показывает счётчик', async () => {
+        vi.mocked(adminApi.impersonationActive).mockResolvedValueOnce([
+            makeSession({ token_id: 1 }),
+            makeSession({ token_id: 2 }),
+            makeSession({ token_id: 3 }),
+        ]);
+        const wrapper = mountBanner();
+        await flushPromises();
+        expect(wrapper.find('[data-testid="impersonation-banner"]').text()).toContain(
+            'Активны impersonation-сессии: 3',
+        );
+        wrapper.unmount();
+    });
+
+    it('tenant_name=null — fallback на «тенант #id»', async () => {
+        vi.mocked(adminApi.impersonationActive).mockResolvedValueOnce([
+            makeSession({ tenant_name: null, tenant_id: 42 }),
+        ]);
+        const wrapper = mountBanner();
+        await flushPromises();
+        expect(wrapper.find('[data-testid="impersonation-banner"]').text()).toContain('тенант #42');
+        wrapper.unmount();
+    });
+
+    it('ошибка impersonationActive — баннер не падает и остаётся скрыт', async () => {
+        vi.mocked(adminApi.impersonationActive).mockRejectedValueOnce(new Error('500'));
+        const wrapper = mountBanner();
+        await flushPromises();
+        expect(wrapper.find('[data-testid="impersonation-banner"]').exists()).toBe(false);
+        wrapper.unmount();
+    });
+
+    it('polling — impersonationActive вызывается повторно через 30 с', async () => {
+        vi.useFakeTimers();
+        vi.mocked(adminApi.impersonationActive).mockResolvedValue([]);
+        const wrapper = mountBanner();
+        await vi.advanceTimersByTimeAsync(0);
+        expect(adminApi.impersonationActive).toHaveBeenCalledTimes(1);
+        await vi.advanceTimersByTimeAsync(30_000);
+        expect(adminApi.impersonationActive).toHaveBeenCalledTimes(2);
+        wrapper.unmount();
+    });
+});