2,4-Xylidine is an organic compound with formula (CH3)2C6H3NH2. It is an aromatic amine, i.e. an aniline. It is prepared by nitration of m-xylene followed by hydrogenation. Commercially significant derivatives include the veterinary drug cymiazole and the colorant Pigment Yellow 81.
It is an isomer of 2,6-xylidine and 3,4-xylidine.

Used as an analytical reagent in the manufacture of dyes.