The title compound, [CuI(C(18)H(15)P)(3)]·C(2)H(3)N, was obtained from the reaction of triphenyl-phosphine and copper(I) iodide in acetonitrile. The monomeric form of the complex has slightly distorted coordination of Cu by the I atom and three P atoms. The crystal structure is stabilized by C-H⋯π inter-actions between phenyl H atoms and phenyl rings. In addition, the complex mol-ecules exhibit C-H⋯N hydrogen bonds between phenyl H atoms and acetonitrile N atoms. The crystal used was an inversion twin, with nearly equal component populations of 0.522 (8) and 0.478 (8).