Thujopsene is a natural chemical compound, classified as a sesquiterpene, with the molecular formula C<sub>15</sub>H<sub>24</sub>.
Thujopsene is found in the essential oil of a variety of conifers, in particular Juniperus cedrus and Thujopsis dolabrata in which it comprises around 2.2% of the weight of the heartwood.
Thujopsene is biosynthesized from farnesyl pyrophosphate (FPP):