The title compound, C(17)H(17)NO, was prepared by the condensation of cinnamaldehyde with p-phenetidine in ethanol. The prop-2-enyl-idene group exhibits an E configuration at the N=C and C=C double bonds, with C-N-C-C and C-C-C-C torsion angles of -179.9 (3) and -175.9 (3)°, respectively. The prop-2-enyl-idene group is not strictly planar [maximum deviation = 0.054 (4) Å] and forms dihedral angles of 28.0 (3) and 34.9 (3)° with the attached aromatic rings.