The asymmetric unit of the title compound, [Zn(C10H6NO2)(2)-(C12H8N2)].1.5C(3)H(7)NO, contains one monomeric zinc complex and 1.5 disordered dimethylformamide solvate molecules. The Zn atom is coordinated to one 1,10-phenanthroline ligand and to two isoquinolinecarboxylate anions (IQC(-)) via their N and O atoms. The complex exhibits a distorted octahedral geometry around the Zn-II atom, with the apical positions occupied by the O atoms of the IQC(-) ligands. The Zn atom lies 0.049 (1) Angstrom out of the basal plane. The crystal packing is characterized by several hydrogen bonds.