The crystal structure of nilutamide [systematic name: 5,5-dimethyl-3-[4-nitro-3-(trifluoromethyl)phenyl]imidazolidine-2,4-dione], C 12H 10F 3N 3O 4, was determined at 150 K. The dihedral angle between the mean planes through the imidazoline [maximum deviation = 0.0396 (14) Å] and benzene rings is 51.49 (5)°. The molecule exhibits intermolecular hydrogen bonding via N—H⋯O interactions, resulting in the formation of chains parallel to the c axis.