α-phellandrene is an organic compound, classified as a cyclic monoterpene. The compound belongs to the group oh phellandrenes, which also includes β-phellandrene, a structural isomer. 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 diethyl ether.

α-Phellandrene was named after Eucalyptus phellandra, from which it was isolated. The phellandrenes are used in fragrances because of their pleasing aromas. α-Phellandrene can form hazardous peroxides with air at elevated temperature.

Phellandrene produces a minty, woody, and mildly citrus aromatic profile and it is easily absorbed, making it a fairly common additive to a host of cosmetic products. It has also been a staple in holistic Eastern medicine for a long time, used for its antifungal and antibacterial properties.

alpha-Phellandrene