The UVI atom in the title complex, [U(C17H15N3O2S)O2(C2H6OS)], exists within a distorted pentagonal–pyramidal geometry where the oxide atoms occupy axial positions [O—U—O = 177.84 (14)°] and the pentagonal plane is defined by the N2O2 atoms of the tetradentate Schiff base ligand and the O atom of the dimethyl sulfoxide molecule. In the crystal, centrosymmetric aggregates are formed via pairs of C—H⋯O interactions. The azomethine C=N atoms and ethylthiolyl group are disordered over two orientations in a 0.828 (3):0.172 (3) ratio