diff --git a/compiler/pipec-ast/src/ast/mod.rs b/compiler/pipec-ast/src/ast/mod.rs
index 9c5cfd4..6b72655 100644
--- a/compiler/pipec-ast/src/ast/mod.rs
+++ b/compiler/pipec-ast/src/ast/mod.rs
@@ -78,6 +78,7 @@ impl<'this> ASTGenerator<'this> {
                 Token::FunctionKeyword => self.consume_function_keyword(),
                 Token::PublicKeyword => self.consume_public_keyword(),
                 Token::TypeKeyword => self.consume_type_keyword(),
+                Token::TraitKeyword => self.consume_trait_keyword(),
                 Token::AtSign => self.consume_attributes(),
                 _v => {
                     println!("{_v:#?}");
@@ -88,6 +89,38 @@ impl<'this> ASTGenerator<'this> {
         }
     }
 
+    #[inline]
+    pub(crate) fn consume_trait_keyword(&mut self) -> ASTNode {
+        self.advance_stream();
+        self.consume_whitespace();
+        let name = self.must_ident();
+        let generics = self.consume_generics();
+        self.consume_whitespace();
+        let mut supertraits = Traits::default();
+        if self.next_is(Token::Colon) {
+            self.advance_stream();
+            supertraits = self.consume_traits();
+        }
+        self.consume_whitespace();
+        self.must(Token::LeftCurly);
+        let mut nodes = Vec::new();
+        loop {
+            self.consume_whitespace();
+            if self.peek_stream() == &Some(Token::RightCurly) {
+                self.advance_stream();
+                break;
+            }
+            nodes.push(self.parse_value());
+        }
+        let tree = ASTTree::new(nodes, self.src);
+        ASTNode::TraitDeclaration {
+            name,
+            generics,
+            supertraits,
+            tree,
+        }
+    }
+
     #[inline]
     pub(crate) fn consume_attributes(&mut self) -> ASTNode {
         let mut attributes = Vec::new();
@@ -317,7 +350,7 @@ impl<'this> ASTGenerator<'this> {
                         v => todo!("{v:#?}"),
                     }
                 }
-                Some(Token::RightSquare) => {
+                Some(Token::RightSquare) | Some(Token::RightCurly) => {
                     break;
                 }
                 _ => todo!(),
@@ -342,7 +375,7 @@ impl<'this> ASTGenerator<'this> {
                         continue;
                     }
                 }
-                Some(Token::Comma) | Some(Token::RightSquare) => {
+                Some(Token::Comma) | Some(Token::RightSquare) | Some(Token::LeftCurly) => {
                     break;
                 }
                 v => todo!("{v:#?}"),
@@ -1288,6 +1321,12 @@ pub enum ASTNode {
         generics: Generics,
         subtype: SubType,
     },
+    TraitDeclaration {
+        name: Span,
+        generics: Generics,
+        supertraits: Traits,
+        tree: ASTTree,
+    },
     Public(Box<Self>),
     Attributed(Vec<Attribute>, Box<Self>),
     EOF,
diff --git a/compiler/pipec-ast/src/tokenizer/mod.rs b/compiler/pipec-ast/src/tokenizer/mod.rs
index 5563a30..2586643 100644
--- a/compiler/pipec-ast/src/tokenizer/mod.rs
+++ b/compiler/pipec-ast/src/tokenizer/mod.rs
@@ -435,6 +435,7 @@ impl<'chars> Tokenizer<'chars> {
             "immutable" => ImmutableKeyword,
             "switch" => SwitchKeyword,
             "type" => TypeKeyword,
+            "trait" => TraitKeyword,
             _ => Token::Ident(input),
         }
     }
@@ -562,6 +563,8 @@ pub enum Token {
     SwitchKeyword,
     /// type
     TypeKeyword,
+    /// trait
+    TraitKeyword,
     /// 21213
     Digit { val: Span, digittype: DigitType },
     /// things_like_this or this_2
diff --git a/compiler/pipec-tests/src/ast/mod.rs b/compiler/pipec-tests/src/ast/mod.rs
index e50318f..5b6b87a 100644
--- a/compiler/pipec-tests/src/ast/mod.rs
+++ b/compiler/pipec-tests/src/ast/mod.rs
@@ -1,4 +1,5 @@
 mod functiondeclaration;
 mod generics;
+mod traits;
 mod variablemutability;
 mod viewportdeclaration;
diff --git a/compiler/pipec-tests/src/ast/traits/mod.rs b/compiler/pipec-tests/src/ast/traits/mod.rs
new file mode 100644
index 0000000..14a198f
--- /dev/null
+++ b/compiler/pipec-tests/src/ast/traits/mod.rs
@@ -0,0 +1,4 @@
+#[test]
+fn test_traits() {
+    crate::test_file_generation!("traits.pipec");
+}
diff --git a/compiler/pipec-tests/src/ast/traits/traits.pipec b/compiler/pipec-tests/src/ast/traits/traits.pipec
new file mode 100644
index 0000000..6903ffd
--- /dev/null
+++ b/compiler/pipec-tests/src/ast/traits/traits.pipec
@@ -0,0 +1,144 @@
+trait Basic {
+	function new() => unsigned32 {}
+}
+
+trait WithGeneric[T] {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithTrait[T : Trait] {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultipleTraits[T : Trait1 + Trait2 + Trait3] {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenerics[T,U] {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericsWithMultipleTraits[T : Trait1 + Trait2 + Trait3 , U : Trait1 + Trait2 + Trait3] {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithGenericTrait[T : Trait[T]] {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultipleGenericTrait[T : Trait1[T] + Trait2[T] + Trait3[T]] {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericWithMultipleGenericTrait[T : Trait1[T] + Trait2[T] + Trait3[T] , U : Trait1[U] + Trait2[U] + Trait3[U]] {
+	function new() => unsigned32 {}
+}
+
+trait BasicWithSuperTrait : Trait1 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithSuperTrait[T] : Trait1 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithTraitWithSuperTrait[T : Trait] : Trait1 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultipleTraitsWithSuperTrait[T : Trait1 + Trait2 + Trait3] : Trait1 {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericsWithSuperTrait[T,U] : Trait1 {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericsWithMultipleTraitsWithSuperTrait[T : Trait1 + Trait2 + Trait3 , U : Trait1 + Trait2 + Trait3] : Trait1 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithGenericTraitWithSuperTrait[T : Trait[T]] : Trait1 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultipleGenericTraitWithSuperTrait[T : Trait1[T] + Trait2[T] + Trait3[T]] : Trait1 {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericWithMultipleGenericTraitWithSuperTrait[T : Trait1[T] + Trait2[T] + Trait3[T] , U : Trait1[U] + Trait2[U] + Trait3[U]] : Trait1 {
+	function new() => unsigned32 {}
+}
+
+trait BasicWithMultiSuperTrait : Trait1 + Trait2 + Trait3 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultiSuperTrait[T] : Trait1 + Trait2 + Trait3 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithTraitWithMultiSuperTrait[T : Trait] : Trait1 + Trait2 + Trait3 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultipleTraitsWithMultiSuperTrait[T : Trait1 + Trait2 + Trait3] : Trait1 + Trait2 + Trait3 {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericsWithMultiSuperTrait[T,U] : Trait1 + Trait2 + Trait3 {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericsWithMultipleTraitsWithMultiSuperTrait[T : Trait1 + Trait2 + Trait3 , U : Trait1 + Trait2 + Trait3] : Trait1 + Trait2 + Trait3 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithGenericTraitWithMultiSuperTrait[T : Trait[T]] : Trait1 + Trait2 + Trait3 {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultipleGenericTraitWithMultiSuperTrait[T : Trait1[T] + Trait2[T] + Trait3[T]] : Trait1 + Trait2 + Trait3 {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericWithMultipleGenericTraitWithMultiSuperTrait[T : Trait1[T] + Trait2[T] + Trait3[T] , U : Trait1[U] + Trait2[U] + Trait3[U]] : Trait1 + Trait2 + Trait3 {
+	function new() => unsigned32 {}
+}
+
+trait BasicWithMultiSuperTraitWithGenerics : Trait1[T] + Trait2[T] + Trait3[T] {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultiSuperTraitWithGenerics[T] : Trait1[T] + Trait2[T] + Trait3[T] {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithTraitWithMultiSuperTraitWithGenerics[T : Trait] : Trait1[T] + Trait2[T] + Trait3[T] {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultipleTraitsWithMultiSuperTraitWithGenerics[T : Trait1 + Trait2 + Trait3] : Trait1[T] + Trait2[T] + Trait3[T] {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericsWithMultiSuperTraitWithGenerics[T,U] : Trait1[T] + Trait2[T] + Trait3[T] {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericsWithMultipleTraitsWithMultiSuperTraitWithGenerics[T : Trait1 + Trait2 + Trait3 , U : Trait1 + Trait2 + Trait3] : Trait1[T] + Trait2[T] + Trait3[T] {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithGenericTraitWithMultiSuperTraitWithGenerics[T : Trait[T]] : Trait1[T] + Trait2[T] + Trait3[T] {
+	function new() => unsigned32 {}
+}
+
+trait WithGenericWithMultipleGenericTraitWithMultiSuperTraitWithGenerics[T : Trait1[T] + Trait2[T] + Trait3[T]] : Trait1[T] + Trait2[T] + Trait3[T] {
+	function new() => unsigned32 {}
+}
+
+trait WithMultipleGenericWithMultipleGenericTraitWithMultiSuperTraitWithGenerics[T : Trait1[T] + Trait2[T] + Trait3[T] , U : Trait1[U] + Trait2[U] + Trait3[U]] : Trait1[T] + Trait2[T] + Trait3[T] {
+	function new() => unsigned32 {}
+}
+