Thujene (or α-thujene) is a natural organic compound classified as a monoterpene.

[1] It is found in the essential oils of a variety of plants, and contributes pungency to the flavor of some herbs such as Summer savory.

[2] The term thujene usually refers to α-thujene.

A less common chemically related double-bond isomer is known as β-thujene (or 2-thujene).

Another double-bond isomer is known as sabinene.