Hectane is an organic compound from the class of straight-chain alkanes, or saturated hydrocarbons. It has 100 carbon atoms in a single chain, without branching. Under normal conditions, it is in a solid state. The chemical formula is C₁₀₀H₂₀₂. The number of possible structural isomers of hectane is 592,107 × 10³⁴.

The compound can be prepared by reacting 1-iodopentadecane with sodium metal and can be recrystallized from xylene.

It is used as an additive to paraffin and petroleum jelly.