Citronellol, or dihydrogeraniol, is a natural acyclic monoterpenoid. Both enantiomers occur in nature. (+)-Citronellol, which is found in citronella oils, including Cymbopogon nardus (50%), is the more common isomer. (−)-Citronellol is found in the oils of rose (18-55%) and Pelargonium geraniums. Citronellol can be prepared by hydrogenation of geraniol or nerol.

Citronellol is used in perfumes and insect repellents, and as a mite attractant. Citronellol is a good mosquito repellent at short distances, but protection greatly lessens when the subject is slightly further from the source. When complexed with β-cyclodextrin, it has on average a 1.5 hour protection duration against mosquitoes. Citronellol is used as a raw material for the production of rose oxide.