diff --git a/frontend/src/features/tenants/components/TenantCard.tsx b/frontend/src/features/tenants/components/TenantCard.tsx
index 08e19f467..8782b2bdb 100644
--- a/frontend/src/features/tenants/components/TenantCard.tsx
+++ b/frontend/src/features/tenants/components/TenantCard.tsx
@@ -198,13 +198,16 @@ export function TenantCard({
   const hue = hueOf(tenant.name || tenant.domain)
   const initial = (tenant.name || tenant.domain).charAt(0).toUpperCase()
   const terminated = tenant.status === 'TERMINATED'
+  const canEnter = readable && !terminated
 
   return (
     <div
+      onClick={canEnter ? () => enterTenant(tenant) : undefined}
       className={cn(
         'group relative flex flex-col overflow-hidden rounded-xl border border-border bg-card shadow-sm transition-all duration-200',
         readable ? 'hover:border-primary/40 hover:shadow-md' : 'opacity-60 saturate-[0.35]',
-        terminated && 'opacity-50'
+        terminated && 'opacity-50',
+        canEnter && 'cursor-pointer'
       )}
     >
       <span
@@ -237,7 +240,10 @@ export function TenantCard({
           </div>
         </div>
 
-        <div className="flex shrink-0 items-center gap-1">
+        <div
+          className="flex shrink-0 items-center gap-1"
+          onClick={(e) => e.stopPropagation()}
+        >
           <button
             type="button"
             onClick={onEdit}
diff --git a/frontend/src/features/tenants/components/TenantSwitcher.tsx b/frontend/src/features/tenants/components/TenantSwitcher.tsx
new file mode 100644
index 000000000..a9c6320c9
--- /dev/null
+++ b/frontend/src/features/tenants/components/TenantSwitcher.tsx
@@ -0,0 +1,164 @@
+import { useCallback, useEffect, useRef, useState } from 'react'
+import { useTranslation } from 'react-i18next'
+import { Building2, ChevronDown, Plus } from 'lucide-react'
+import { cn } from '@/shared/lib/utils'
+import { useAuth } from '@/features/auth'
+import { setSupportTenant, useSupportTenant } from '@/shared/lib/current-tenant'
+import {
+  canReadTenant,
+  tenantsHttpService,
+} from '../services/tenants-http.service'
+import type { Tenant } from '../types/tenant.types'
+import { CreateTenantDialog } from './CreateTenantDialog'
+
+/**
+ * Topbar switcher for the tenant the current session is reading against.
+ *
+ * Rendered only for admins. The tenants list is exempt from the support-tenant
+ * header, so it works even mid-session; on the endpoint responding 403 (a role
+ * that says admin but not to this endpoint) the switcher hides itself.
+ *
+ * Entering a tenant is a hard navigation, same reason as the tenant cards: the
+ * react-query caches, branding and notification feed all belong to whoever we
+ * were before, and a soft navigation would leave them on screen next to the
+ * other tenant's data.
+ */
+export function TenantSwitcher() {
+  const { t } = useTranslation()
+  const { isAdmin, tenantId: ownId } = useAuth()
+  const support = useSupportTenant()
+  const [tenants, setTenants] = useState<Tenant[]>([])
+  const [failed, setFailed] = useState(false)
+  const [open, setOpen] = useState(false)
+  const [creating, setCreating] = useState(false)
+  const ref = useRef<HTMLDivElement>(null)
+
+  const load = useCallback(async () => {
+    if (!isAdmin) return
+    try {
+      const list = await tenantsHttpService.list({ size: 200 })
+      setTenants(
+        list.filter(
+          (x) => x.id !== ownId && canReadTenant(x) && x.status !== 'TERMINATED'
+        )
+      )
+      setFailed(false)
+    } catch {
+      setFailed(true)
+    }
+  }, [ownId, isAdmin])
+
+  useEffect(() => {
+    void load()
+  }, [load])
+
+  useEffect(() => {
+    if (!open) return
+    const onDoc = (e: MouseEvent) => {
+      if (ref.current && !ref.current.contains(e.target as Node)) setOpen(false)
+    }
+    document.addEventListener('mousedown', onDoc)
+    return () => document.removeEventListener('mousedown', onDoc)
+  }, [open])
+
+  if (!isAdmin || failed) return null
+
+  // Reload in place so the target tenant's data replaces ours, but bounce off
+  // /tenants first: entering a tenant strips access to that page, so staying
+  // there would just 403 on the next load.
+  const reloadAfterSwitch = () => {
+    if (window.location.pathname.startsWith('/tenants')) {
+      window.location.assign('/home')
+    } else {
+      window.location.reload()
+    }
+  }
+
+  const enterSelf = () => {
+    setOpen(false)
+    setSupportTenant(null)
+    reloadAfterSwitch()
+  }
+
+  const enter = (tenant: Tenant) => {
+    setOpen(false)
+    setSupportTenant({
+      id: tenant.id,
+      name: tenant.name,
+      access: tenant.supportAccess === 'FULL' ? 'FULL' : 'READ',
+    })
+    reloadAfterSwitch()
+  }
+
+  const selfLabel = t('tenants.switcher.self', { defaultValue: 'Default tenant' })
+  const current = support?.name ?? selfLabel
+
+  return (
+    <div className="relative" ref={ref}>
+      <button
+        onClick={() => setOpen((v) => !v)}
+        aria-label={t('tenants.switcher.aria', { defaultValue: 'Switch tenant' })}
+        className={cn(
+          'flex h-9 items-center gap-1.5 rounded-md border border-border bg-muted/40 px-2.5 text-[12px] transition-colors',
+          open
+            ? 'bg-muted text-foreground'
+            : 'text-muted-foreground hover:bg-muted hover:text-foreground'
+        )}
+      >
+        <Building2 size={13} strokeWidth={1.75} />
+        <span className="max-w-[9rem] truncate">{current}</span>
+        <ChevronDown
+          size={12}
+          className={cn('transition-transform duration-150', open ? 'rotate-180' : 'rotate-0')}
+        />
+      </button>
+      {open && (
+        <div className="absolute right-0 top-full z-50 mt-1 w-64 overflow-hidden rounded-md border border-border bg-popover text-popover-foreground shadow-lg">
+          <div className="max-h-72 overflow-y-auto py-1">
+            <button
+              onClick={enterSelf}
+              className={cn(
+                'block w-full truncate px-3 py-1.5 text-left text-sm hover:bg-muted',
+                !support && 'font-semibold text-primary'
+              )}
+            >
+              {selfLabel}
+            </button>
+            {tenants.map((tn) => (
+              <button
+                key={tn.id}
+                onClick={() => enter(tn)}
+                title={tn.name}
+                className={cn(
+                  'block w-full truncate px-3 py-1.5 text-left text-sm hover:bg-muted',
+                  support?.id === tn.id && 'font-semibold text-primary'
+                )}
+              >
+                {tn.name}
+              </button>
+            ))}
+          </div>
+          <button
+            onClick={() => {
+              setOpen(false)
+              setCreating(true)
+            }}
+            className="flex w-full items-center gap-2 border-t border-border px-3 py-2 text-left text-sm text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
+          >
+            <Plus size={13} strokeWidth={1.75} />
+            {t('tenants.switcher.create', { defaultValue: 'Create tenant' })}
+          </button>
+        </div>
+      )}
+      {creating && (
+        <CreateTenantDialog
+          onClose={() => setCreating(false)}
+          onCreated={() => {
+            setCreating(false)
+            void load()
+          }}
+        />
+      )}
+    </div>
+  )
+}
diff --git a/frontend/src/shared/i18n/locales/en.json b/frontend/src/shared/i18n/locales/en.json
index ad0950b77..e7c52f6a4 100644
--- a/frontend/src/shared/i18n/locales/en.json
+++ b/frontend/src/shared/i18n/locales/en.json
@@ -5472,6 +5472,11 @@
       "notFound": "Tenant not found",
       "invalidRequest": "Invalid request",
       "operationFailed": "Operation failed"
+    },
+    "switcher": {
+      "aria": "Switch tenant",
+      "self": "Default tenant",
+      "create": "Create tenant"
     }
   },
   "supportAccess": {
diff --git a/frontend/src/shared/layouts/DashboardLayout/Topbar.tsx b/frontend/src/shared/layouts/DashboardLayout/Topbar.tsx
index a1d42458e..180132096 100644
--- a/frontend/src/shared/layouts/DashboardLayout/Topbar.tsx
+++ b/frontend/src/shared/layouts/DashboardLayout/Topbar.tsx
@@ -28,6 +28,7 @@ import { useCurrentInstanceId } from '@/shared/lib/current-instance'
 import { InstanceSelector } from '@/features/federation/components/InstanceSelector'
 import { useFederationVersion } from '@/features/federation/hooks/use-version'
 import { useBilling } from '@/features/billing'
+import { TenantSwitcher } from '@/features/tenants/components/TenantSwitcher'
 import {
   NotificationRow,
   useNotificationFeed,
@@ -196,6 +197,7 @@ export function Topbar() {
 
       {/* Right cluster */}
       <div className="flex items-center gap-1">
+        <TenantSwitcher />
         <div className="relative" ref={notifRef}>
           <IconButton
             label={t('notifications.title')}