Heptane is any chemical compound having the formula C₇H₁₆. Such compounds are saturated hydrocarbons (alkanes).

Normal heptane (n-heptane), CH₃[CH₂]₅CH₃, is a colorless inflammable liquid; boiling point 98°C. It occurs with other isomeric hydrocarbons, in petroleum, and is used in car fuels to determine octane ratings. It has the general properties of paraffins. Eight other paraffin hydrocarbons of the formula C₇H₁₆ are possible.