2-Methylbenzaldehyde is an organic compound with the formula CH<sub>3</sub>C<sub>6</sub>H<sub>4</sub>CHO. It is a colorless liquid.
Of its many reactions, 2-methylbenzaldehyde undergoes BF<sub>3</sub>-induced Rothemund condensation with pyrrole to give atropoisomers of tetrakis(o-tolyl)porphyrin.
It is one of main benzaldehyde component of automobile exhaust.