Nonacosane is a straight-chain hydrocarbon with a molecular formula of C29H60, and the structural formula CH3(CH2)27CH3.

It has 1,590,507,121 constitutional isomers.

Nonacosane occurs naturally and has been reported to be a component of a pheromone of Orgyia leucostigma,[2] and evidence suggests it plays a role in the chemical communication of several insects, including the female Anopheles stephensi (a mosquito).

[3] Nonacosane has been identified within several essential oils.

It can also be prepared synthetically.