Tridecane or n-tridecane is an alkane with the chemical formula CH<sub>3</sub>(CH<sub>2</sub>)<sub>11</sub>CH<sub>3</sub>. Tridecane is a combustible colourless liquid. In industry, they have no specific value aside from being components of various fuels and solvents. In the research laboratory, tridecane is also used as a distillation chaser.
Nymphs of the southern green shield bug produce tridecane as a dispersion/aggregation pheromone, which possibly serves as a defense against predators. It is also the main component of the defensive fluid produced by the stink bug Cosmopepla bimaculata.