A novel manganese coordination polymer [Mn(L)2(bipy)]n (HL = 3,5-dimethylbenzoic acid, 4,4'-bipy = 4,4'-bipyridine) has been synthesized by a hydrothermal method. The molecular and crystal structures were determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group C2/c with a = 2.0996(8), b = 1.1835(5), c = 0.9958(4) nm, β =110.161(5)°, V= 2.3229(16) nm3, Z = 4, C28H26MnN2O4, Mr = 509.45, Dc= 1.457 g/cm3,μ = 0.607mm-1, F(000) = 1060, Rint= 0.0566, R = 0.0334 and wR = 0.1078. In the crystal the manganese atom is six-coordinated by two nitrogen atoms from 4,4'-bipy and four oxygen atoms from 3,5-dimethylbenzolate molecules, completing an octahedral geometry. The 4,4'-bipy molecules bridge the infinite chain [Mn(L)2(bipy)]n to form a two-dimensional layer.