p-Tolunitrile, also known as 4-methylbenzonitrile, is an aromatic organic compound with the formula CH₃C₆H₄CN. It consists of a benzene ring substituted with a methyl group (CH₃) at the para position relative to a nitrile group (−CN). It appears as a colorless to pale yellow liquid or solid, depending on temperature. p-Tolunitrile is used as an intermediate in the synthesis of dyes, pharmaceuticals, and agrochemicals. It has a characteristic aromatic odor and is relatively stable, though it should be handled with care due to the toxic nature of nitriles.