The title compound (C(5)H(14)NO)(4)[Cu(2)(CH(3)COO)(4)Cl(2)]Cl(2), consists of a pair of Cu(II) ions bridged by four acetate groups, resulting in a Cu(2)(CH(3)COO)(4) unit, four (3-hydroxy-prop-yl)dimethyl-ammonium cations (two crystallographically independent pairs) and two chloride anions. The Cu atoms at both termini are bonded to chloride anions. The latter are hydrogen bonded to one of the two pairs of crystallographically independent (3-hydroxy-prop-yl)dimethyl-ammonium cations. The Cu(2)(CH(3)COO)(4) unit is located on a crystallographic inversion center, and the geometry around each metal center is close to octa-hedral. The Cl-Cu-Cu angles are nearly linear [177.48 (2)°] and the Cu-O bond lengths are in the range 1.9712 (18)-1.9809 (19) Å. The Cu⋯Cu separation between the two acetate-bridged Cu(II) centers is 2.6793 (8) Å. The packing of the crystal structure is dominated by N-H⋯Cl hydrogen bonding between the ammonium groups and the chloride anions, as well as by O-H⋯O and O-H⋯Cl hydrogen bonds. One of the 3-hydroxypropyldimethylammonium cations shows orientational disorder with an occupancy ratio of 0.812 (4): 0.188 (4).