The asymmetric unit of the title compound, [CuCl(C(10)H(6)NO(2))(C(14)H(12)N(2))], contains two monomeric copper molecules, A and B. Each Cu atom is coordinated to one 2,9-dimethyl-1,10-phenanthroline (neocuproine) ligand via both N atoms, to one isoquinoline-1-carboxylate anion (IQC(-)) via the N and one O atom, and to one Cl(-) anion. The environment of the Cu atom is approximately square pyramidal, with the apical position occupied by an N atom of neocuproine. In molecule A, the Cu atom is 0.301 (1) A above the basal plane; this distance is 0.316 (1) A in molecule B. The crystal packing is characterized by several hydrogen bonds.