The title compound, [Cu4Cl6O(C12H14N2)(4)], is a new example of the well known [Cu-4(mu(4)-O)(mu-X)(6)L-4] class of complex (X- is Cl-, Br- or I-, and L is a monodentate ligand). The molecule has crystallographic C-2 symmetry, with two Cl- ions on each edge of a Cu-4 tetrahedron. Two of these, on opposite edges of the tetrahedron, accept intramolecular hydrogen bonds from two of the pyrazole N-H donors.