diff --git a/src/Identity.php b/src/Identity.php
index 18d5281b..1f005160 100644
--- a/src/Identity.php
+++ b/src/Identity.php
@@ -109,6 +109,12 @@ public function get(?string $field = null): mixed
         $map = $this->_config['fieldMap'];
         if (isset($map[$field])) {
             $field = $map[$field];
+        } else {
+            // Check if the first segment of a dot-separated path has a mapping
+            $parts = explode('.', $field, 2);
+            if (isset($parts[1]) && isset($map[$parts[0]])) {
+                $field = $map[$parts[0]] . '.' . $parts[1];
+            }
         }
 
         return Hash::get($this->data, $field);
diff --git a/tests/TestCase/IdentityTest.php b/tests/TestCase/IdentityTest.php
index 4f8ba363..9e007782 100644
--- a/tests/TestCase/IdentityTest.php
+++ b/tests/TestCase/IdentityTest.php
@@ -61,6 +61,43 @@ public function testGet(): void
         $this->assertSame($data, $identity->get());
     }
 
+    /**
+     * Test field mapping with dot notation
+     *
+     * @return void
+     */
+    public function testFieldMappingWithDotNotation(): void
+    {
+        $data = [
+            'id' => 1,
+            'user_account' => new Entity(['id' => 2, 'role' => 'admin']),
+            'profile_data' => ['email' => 'test@example.com', 'preferences' => ['theme' => 'dark']],
+        ];
+
+        $identity = new Identity($data, [
+            'fieldMap' => [
+                'account' => 'user_account',
+                'profile' => 'profile_data',
+            ],
+        ]);
+
+        // Test that mapped fields can be accessed directly
+        $this->assertInstanceOf(Entity::class, $identity->get('account'));
+        $this->assertSame(['email' => 'test@example.com', 'preferences' => ['theme' => 'dark']], $identity->get('profile'));
+
+        // Test that fieldMap works with dot notation for nested access
+        $this->assertSame('admin', $identity->get('account.role'));
+        $this->assertSame('test@example.com', $identity->get('profile.email'));
+        $this->assertSame('dark', $identity->get('profile.preferences.theme'));
+
+        // Test that original field names still work with dot notation
+        $this->assertSame('admin', $identity->get('user_account.role'));
+        $this->assertSame('test@example.com', $identity->get('profile_data.email'));
+
+        // Test that non-mapped fields with dot notation still work
+        $this->assertNull($identity->get('missing.field'));
+    }
+
     /**
      * Test mapping fields
      *