diff --git a/rules.neon b/rules.neon
index 66d47315..7e1e6bc8 100644
--- a/rules.neon
+++ b/rules.neon
@@ -19,6 +19,8 @@ rules:
 	- PHPStan\Rules\Doctrine\ORM\DqlRule
 	- PHPStan\Rules\Doctrine\ORM\RepositoryMethodCallRule
 	- PHPStan\Rules\Doctrine\ORM\EntityRelationRule
+	- PHPStan\Rules\Doctrine\ORM\EntityMustNotBeFinalRule
+	- PHPStan\Rules\Doctrine\ORM\EntityMustNotContainFinalMethodsRule
 
 services:
 	-
diff --git a/src/Rules/Doctrine/ORM/EntityMustNotBeFinalRule.php b/src/Rules/Doctrine/ORM/EntityMustNotBeFinalRule.php
new file mode 100644
index 00000000..484a39e6
--- /dev/null
+++ b/src/Rules/Doctrine/ORM/EntityMustNotBeFinalRule.php
@@ -0,0 +1,58 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use PhpParser\Node;
+use PHPStan\Analyser\Scope;
+use PHPStan\Rules\Rule;
+use PHPStan\Type\Doctrine\ObjectMetadataResolver;
+use function sprintf;
+
+class EntityMustNotBeFinalRule implements Rule
+{
+
+	/** @var \PHPStan\Type\Doctrine\ObjectMetadataResolver */
+	private $objectMetadataResolver;
+
+	public function __construct(ObjectMetadataResolver $objectMetadataResolver)
+	{
+		$this->objectMetadataResolver = $objectMetadataResolver;
+	}
+
+	public function getNodeType(): string
+	{
+		return Node\Stmt\Class_::class;
+	}
+
+	/**
+	 * @param \PhpParser\Node\Stmt\Class_ $node
+	 * @param \PHPStan\Analyser\Scope $scope
+	 * @return string[]
+	 */
+	public function processNode(Node $node, Scope $scope): array
+	{
+		$objectManager = $this->objectMetadataResolver->getObjectManager();
+		if ($objectManager === null) {
+			return [];
+		}
+
+		$className = (string) $node->namespacedName;
+
+		// not an entity
+		if ($objectManager->getMetadataFactory()->isTransient($className)) {
+			return [];
+		}
+
+		if ($node->isFinal()) {
+			return [
+				sprintf(
+					'Class %s is a Doctrine ORM entity, so it should not be marked as final',
+					$className
+				),
+			];
+		}
+
+		return [];
+	}
+
+}
diff --git a/src/Rules/Doctrine/ORM/EntityMustNotContainFinalMethodsRule.php b/src/Rules/Doctrine/ORM/EntityMustNotContainFinalMethodsRule.php
new file mode 100644
index 00000000..8df9bb8c
--- /dev/null
+++ b/src/Rules/Doctrine/ORM/EntityMustNotContainFinalMethodsRule.php
@@ -0,0 +1,62 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use PhpParser\Node;
+use PHPStan\Analyser\Scope;
+use PHPStan\Rules\Rule;
+use PHPStan\Type\Doctrine\ObjectMetadataResolver;
+use function sprintf;
+
+class EntityMustNotContainFinalMethodsRule implements Rule
+{
+
+	/** @var \PHPStan\Type\Doctrine\ObjectMetadataResolver */
+	private $objectMetadataResolver;
+
+	public function __construct(ObjectMetadataResolver $objectMetadataResolver)
+	{
+		$this->objectMetadataResolver = $objectMetadataResolver;
+	}
+
+	public function getNodeType(): string
+	{
+		return Node\Stmt\ClassMethod::class;
+	}
+
+	/**
+	 * @param \PhpParser\Node\Stmt\ClassMethod $node
+	 * @param \PHPStan\Analyser\Scope $scope
+	 * @return string[]
+	 */
+	public function processNode(Node $node, Scope $scope): array
+	{
+		$class = $scope->getClassReflection();
+		if ($class === null) {
+			return [];
+		}
+
+		$objectManager = $this->objectMetadataResolver->getObjectManager();
+		if ($objectManager === null) {
+			return [];
+		}
+
+		$className = $class->getName();
+		if ($objectManager->getMetadataFactory()->isTransient($className)) {
+			return [];
+		}
+
+		if ($node->isFinal()) {
+			return [
+				sprintf(
+					'Class %s is a Doctrine ORM entity, so its method %s() must not be marked as final.',
+					$className,
+					(string) $node->name
+				),
+			];
+		}
+
+		return [];
+	}
+
+}
diff --git a/tests/Rules/Doctrine/ORM/EntityMustNotBeFinalRuleTest.php b/tests/Rules/Doctrine/ORM/EntityMustNotBeFinalRuleTest.php
new file mode 100644
index 00000000..5ce9804d
--- /dev/null
+++ b/tests/Rules/Doctrine/ORM/EntityMustNotBeFinalRuleTest.php
@@ -0,0 +1,45 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use Iterator;
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+use PHPStan\Type\Doctrine\ObjectMetadataResolver;
+
+class EntityMustNotBeFinalRuleTest extends RuleTestCase
+{
+
+	protected function getRule(): Rule
+	{
+		return new EntityMustNotBeFinalRule(
+			new ObjectMetadataResolver(__DIR__ . '/entity-manager.php', null)
+		);
+	}
+
+	/**
+	 * @dataProvider ruleProvider
+	 */
+	public function testRule(string $file, array $expectedErrors): void
+	{
+		$this->analyse([$file], $expectedErrors);
+	}
+
+	public function ruleProvider(): Iterator
+	{
+		yield 'regular class' => [__DIR__ . '/data/FinalClassNotAnEntity.php', []];
+
+		yield 'nice entity' => [__DIR__ . '/data/EntityWithRelations.php', []];
+
+		yield 'final entity class' => [
+			__DIR__ . '/data/FinalEntity.php',
+			[
+				[
+					'Class PHPStan\Rules\Doctrine\ORM\FinalEntity is a Doctrine ORM entity, so it should not be marked as final',
+					10,
+				],
+			],
+		];
+	}
+
+}
diff --git a/tests/Rules/Doctrine/ORM/EntityMustNotContainFinalMethodsRuleTest.php b/tests/Rules/Doctrine/ORM/EntityMustNotContainFinalMethodsRuleTest.php
new file mode 100644
index 00000000..26362bbd
--- /dev/null
+++ b/tests/Rules/Doctrine/ORM/EntityMustNotContainFinalMethodsRuleTest.php
@@ -0,0 +1,45 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use Iterator;
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+use PHPStan\Type\Doctrine\ObjectMetadataResolver;
+
+class EntityMustNotContainFinalMethodsRuleTest extends RuleTestCase
+{
+
+	protected function getRule(): Rule
+	{
+		return new EntityMustNotContainFinalMethodsRule(
+			new ObjectMetadataResolver(__DIR__ . '/entity-manager.php', null)
+		);
+	}
+
+	/**
+	 * @dataProvider ruleProvider
+	 */
+	public function testRule(string $file, array $expectedErrors): void
+	{
+		$this->analyse([$file], $expectedErrors);
+	}
+
+	public function ruleProvider(): Iterator
+	{
+		yield 'regular class' => [__DIR__ . '/data/FinalClassNotAnEntity.php', []];
+
+		yield 'nice entity' => [__DIR__ . '/data/EntityWithRelations.php', []];
+
+		yield 'entity with final method' => [
+			__DIR__ . '/data/EntityWithFinalMethod.php',
+			[
+				[
+					'Class PHPStan\Rules\Doctrine\ORM\EntityWithFinalMethod is a Doctrine ORM entity, so its method getData() must not be marked as final.',
+					31,
+				],
+			],
+		];
+	}
+
+}
diff --git a/tests/Rules/Doctrine/ORM/data/EntityWithFinalMethod.php b/tests/Rules/Doctrine/ORM/data/EntityWithFinalMethod.php
new file mode 100644
index 00000000..487c0ca4
--- /dev/null
+++ b/tests/Rules/Doctrine/ORM/data/EntityWithFinalMethod.php
@@ -0,0 +1,36 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @ORM\Entity()
+ */
+class EntityWithFinalMethod
+{
+
+	/**
+	 * @ORM\Id()
+	 * @ORM\GeneratedValue()
+	 * @ORM\Column(type="integer")
+	 *
+	 * @var int
+	 */
+	private $id;
+
+	/**
+	 * @ORM\Column(type="string")
+	 * @var string
+	 */
+	private $name;
+
+	/**
+	 * @return mixed[]
+	 */
+	public final function getData(): array
+	{
+		return [];
+	}
+
+}
diff --git a/tests/Rules/Doctrine/ORM/data/FinalClassNotAnEntity.php b/tests/Rules/Doctrine/ORM/data/FinalClassNotAnEntity.php
new file mode 100644
index 00000000..4f8cc217
--- /dev/null
+++ b/tests/Rules/Doctrine/ORM/data/FinalClassNotAnEntity.php
@@ -0,0 +1,16 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+final class FinalClassNotAnEntity
+{
+
+	/**
+	 * @return mixed[]
+	 */
+	final public function getData(): array
+	{
+		return [];
+	}
+
+}
diff --git a/tests/Rules/Doctrine/ORM/data/FinalEntity.php b/tests/Rules/Doctrine/ORM/data/FinalEntity.php
new file mode 100644
index 00000000..cb011f84
--- /dev/null
+++ b/tests/Rules/Doctrine/ORM/data/FinalEntity.php
@@ -0,0 +1,28 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @ORM\Entity()
+ */
+final class FinalEntity
+{
+
+	/**
+	 * @ORM\Id()
+	 * @ORM\GeneratedValue()
+	 * @ORM\Column(type="integer")
+	 *
+	 * @var int
+	 */
+	private $id;
+
+	/**
+	 * @var string
+	 * @ORM\Column(type="string")
+	 */
+	private $name;
+
+}