Phellandrene is the name for a pair of organic compounds, has citrus odor that have a similar molecular structure and similar chemical properties. α-Phellandrene and β-Phellandrene are cyclic monoterpenes and are double-bond isomers. In α-Phellandrene, both double bonds are endocyclic and in β-Phellandrene, one of them is exocyclic. Both are insoluble in water, but miscible with ether.

β-Phellandrene is used in fragrances because of their pleasing aromas. The odor of β-Phellandrene has been described as peppery-minty and slightly citrusy. β-Phellandrene is used as insect-resist & insecticide, materials of terpenic resin and synthetic menthol.