diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 86f74ac..a144af8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -153,6 +153,10 @@ jobs:
           fdbcli -C fdb.cluster --exec "status" || true
           exit 1
 
+      - name: Configure tenant mode
+        run: |
+          fdbcli -C fdb.cluster --exec "configure tenant_mode=optional_experimental"
+
       - name: Run E2E tests
         env:
           FDB_CLUSTER_FILE: fdb.cluster
diff --git a/src/Database.php b/src/Database.php
index b7097fd..aaeaa02 100644
--- a/src/Database.php
+++ b/src/Database.php
@@ -27,6 +27,21 @@ public function createTransaction(): Transaction
         return new Transaction($trPointer, $this, $this->client);
     }
 
+    public function openTenant(string $name): Tenant
+    {
+        $tpointer = $this->client->fdb->new('FDBTenant*');
+        $this->client->checkError(
+            $this->client->fdb->fdb_database_open_tenant(
+                $this->dpointer,
+                $name,
+                strlen($name),
+                FFI::addr($tpointer),
+            ),
+        );
+
+        return new Tenant($tpointer, $this, $this->client);
+    }
+
     public function transact(callable $fn): mixed
     {
         $tr = $this->createTransaction();
diff --git a/src/NativeClient.php b/src/NativeClient.php
index 260bda0..dd06187 100644
--- a/src/NativeClient.php
+++ b/src/NativeClient.php
@@ -71,6 +71,7 @@ final class NativeClient
 
         void fdb_tenant_destroy(FDBTenant* t);
         fdb_error_t fdb_tenant_create_transaction(FDBTenant* t, FDBTransaction** out_transaction);
+        FDBFuture* fdb_tenant_get_id(FDBTenant* tenant);
 
         void fdb_transaction_destroy(FDBTransaction* tr);
         void fdb_transaction_cancel(FDBTransaction* tr);
diff --git a/src/Tenant.php b/src/Tenant.php
index 72fc1fc..7b514eb 100644
--- a/src/Tenant.php
+++ b/src/Tenant.php
@@ -4,6 +4,7 @@
 
 namespace CrazyGoat\FoundationDB;
 
+use CrazyGoat\FoundationDB\Future\FutureInt64;
 use FFI;
 use FFI\CData;
 
@@ -26,6 +27,16 @@ public function createTransaction(): Transaction
         return new Transaction($trPointer, $this->db, $this->client);
     }
 
+    public function getId(): int
+    {
+        $future = new FutureInt64(
+            $this->client->fdb->fdb_tenant_get_id($this->tpointer),
+            $this->client,
+        );
+
+        return $future->await();
+    }
+
     public function __destruct()
     {
         $this->client->fdb->fdb_tenant_destroy($this->tpointer);
diff --git a/tests/Integration/TenantTest.php b/tests/Integration/TenantTest.php
new file mode 100644
index 0000000..10b98a4
--- /dev/null
+++ b/tests/Integration/TenantTest.php
@@ -0,0 +1,138 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CrazyGoat\FoundationDB\Tests\Integration;
+
+use CrazyGoat\FoundationDB\Database;
+use CrazyGoat\FoundationDB\FoundationDB;
+use CrazyGoat\FoundationDB\Tenant;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+final class TenantTest extends TestCase
+{
+    private static bool $initialized = false;
+
+    private static Database $db;
+
+    protected function setUp(): void
+    {
+        if (!self::$initialized) {
+            FoundationDB::reset();
+            FoundationDB::apiVersion(730);
+            self::$db = FoundationDB::open();
+            self::$initialized = true;
+        }
+
+        $this->configureTenantMode();
+    }
+
+    #[Test]
+    public function openTenantReturnsTenantInstance(): void
+    {
+        $this->createTenantViaFdbcli('test_tenant_open');
+
+        try {
+            $tenant = self::$db->openTenant('test_tenant_open');
+            self::assertInstanceOf(Tenant::class, $tenant);
+        } finally {
+            $this->deleteTenantViaFdbcli('test_tenant_open');
+        }
+    }
+
+    #[Test]
+    public function tenantGetIdReturnsPositiveInteger(): void
+    {
+        $this->createTenantViaFdbcli('test_tenant_id');
+
+        try {
+            $tenant = self::$db->openTenant('test_tenant_id');
+            $id = $tenant->getId();
+            self::assertGreaterThan(0, $id);
+        } finally {
+            $this->deleteTenantViaFdbcli('test_tenant_id');
+        }
+    }
+
+    #[Test]
+    public function tenantGetIdReturnsSameIdForSameTenant(): void
+    {
+        $this->createTenantViaFdbcli('test_tenant_same_id');
+
+        try {
+            $tenant1 = self::$db->openTenant('test_tenant_same_id');
+            $tenant2 = self::$db->openTenant('test_tenant_same_id');
+            self::assertSame($tenant1->getId(), $tenant2->getId());
+        } finally {
+            $this->deleteTenantViaFdbcli('test_tenant_same_id');
+        }
+    }
+
+    #[Test]
+    public function tenantGetIdReturnsDifferentIdsForDifferentTenants(): void
+    {
+        $this->createTenantViaFdbcli('test_tenant_diff_a');
+        $this->createTenantViaFdbcli('test_tenant_diff_b');
+
+        try {
+            $tenantA = self::$db->openTenant('test_tenant_diff_a');
+            $tenantB = self::$db->openTenant('test_tenant_diff_b');
+            self::assertNotSame($tenantA->getId(), $tenantB->getId());
+        } finally {
+            $this->deleteTenantViaFdbcli('test_tenant_diff_a');
+            $this->deleteTenantViaFdbcli('test_tenant_diff_b');
+        }
+    }
+
+    #[Test]
+    public function tenantCanCreateTransactionAndPerformCrud(): void
+    {
+        $this->createTenantViaFdbcli('test_tenant_crud');
+
+        try {
+            $tenant = self::$db->openTenant('test_tenant_crud');
+            $tr = $tenant->createTransaction();
+            $tr->set('tenant_key', 'tenant_value');
+            $tr->commit()->await();
+
+            $tr2 = $tenant->createTransaction();
+            $value = $tr2->get('tenant_key')->await();
+            self::assertSame('tenant_value', $value);
+
+            $tr3 = $tenant->createTransaction();
+            $tr3->clear('tenant_key');
+            $tr3->commit()->await();
+        } finally {
+            $this->deleteTenantViaFdbcli('test_tenant_crud');
+        }
+    }
+
+    private function configureTenantMode(): void
+    {
+        $clusterFile = getenv('FDB_CLUSTER_FILE') ?: '/etc/foundationdb/fdb.cluster';
+        $output = (string) shell_exec(
+            "fdbcli -C {$clusterFile} --exec 'configure tenant_mode=optional_experimental' 2>&1",
+        );
+        if (!str_contains($output, 'committed') && !str_contains($output, 'already')) {
+            self::markTestSkipped('Could not configure tenant mode: ' . $output);
+        }
+    }
+
+    private function createTenantViaFdbcli(string $name): void
+    {
+        $clusterFile = getenv('FDB_CLUSTER_FILE') ?: '/etc/foundationdb/fdb.cluster';
+        $output = (string) shell_exec(
+            "fdbcli -C {$clusterFile} --exec 'createtenant {$name}' 2>&1",
+        );
+        if (!str_contains($output, 'created') && !str_contains($output, 'already exists')) {
+            self::markTestSkipped('Could not create tenant: ' . $output);
+        }
+    }
+
+    private function deleteTenantViaFdbcli(string $name): void
+    {
+        $clusterFile = getenv('FDB_CLUSTER_FILE') ?: '/etc/foundationdb/fdb.cluster';
+        shell_exec("fdbcli -C {$clusterFile} --exec 'deletetenant {$name}' 2>&1");
+    }
+}