diff --git a/conf/config.level0.neon b/conf/config.level0.neon
index 94180093b8..e7f78dc3e2 100644
--- a/conf/config.level0.neon
+++ b/conf/config.level0.neon
@@ -31,6 +31,7 @@ rules:
 	- PHPStan\Rules\Classes\InvalidPromotedPropertiesRule
 	- PHPStan\Rules\Classes\NewStaticRule
 	- PHPStan\Rules\Classes\NonClassAttributeClassRule
+	- PHPStan\Rules\Classes\TraitAttributeClassRule
 	- PHPStan\Rules\Exceptions\ThrowExpressionRule
 	- PHPStan\Rules\Functions\ArrowFunctionReturnNullsafeByRefRule
 	- PHPStan\Rules\Functions\CallToFunctionParametersRule
diff --git a/src/Rules/Classes/TraitAttributeClassRule.php b/src/Rules/Classes/TraitAttributeClassRule.php
new file mode 100644
index 0000000000..454d063a3a
--- /dev/null
+++ b/src/Rules/Classes/TraitAttributeClassRule.php
@@ -0,0 +1,37 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Classes;
+
+use PhpParser\Node;
+use PHPStan\Analyser\Scope;
+use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
+
+/**
+ * @implements Rule<Node\Stmt\Trait_>
+ */
+class TraitAttributeClassRule implements Rule
+{
+
+	public function getNodeType(): string
+	{
+		return Node\Stmt\Trait_::class;
+	}
+
+	public function processNode(Node $node, Scope $scope): array
+	{
+		foreach ($node->attrGroups as $attrGroup) {
+			foreach ($attrGroup->attrs as $attr) {
+				$name = $attr->name->toLowerString();
+				if ($name === 'attribute') {
+					return [
+						RuleErrorBuilder::message('Trait cannot be an Attribute class.')->build(),
+					];
+				}
+			}
+		}
+
+		return [];
+	}
+
+}
diff --git a/tests/PHPStan/Rules/Classes/TraitAttributeClassRuleTest.php b/tests/PHPStan/Rules/Classes/TraitAttributeClassRuleTest.php
new file mode 100644
index 0000000000..fc08dcfe74
--- /dev/null
+++ b/tests/PHPStan/Rules/Classes/TraitAttributeClassRuleTest.php
@@ -0,0 +1,32 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Classes;
+
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+
+/**
+ * @extends RuleTestCase<TraitAttributeClassRule>
+ */
+class TraitAttributeClassRuleTest extends RuleTestCase
+{
+
+	protected function getRule(): Rule
+	{
+		return new TraitAttributeClassRule();
+	}
+
+	public function testRule(): void
+	{
+		if (!self::$useStaticReflectionProvider && PHP_VERSION_ID < 80000) {
+			$this->markTestSkipped('Test requires PHP 8.0.');
+		}
+		$this->analyse([__DIR__ . '/data/non-class-attribute-class.php'], [
+			[
+				'Trait cannot be an Attribute class.',
+				11,
+			],
+		]);
+	}
+
+}