In the title compound, [Co(C(4)H(9))(C(4)H(7)N(2)O(2))(2)(C(5)H(5)N)], which was prepared as a model complex of vitamin B(12), the Co(III) atom is coordinated by a butyl group, a pyridine and two N,N'-bidentate dimethyl-glyoximate ligands in a distorted octa-hedral geometry. The bis-chelating dimethyl-glyoximate ligands, which occupy equatorial sites, are linked by strong intra-molecular O-H⋯O hydrogen bonds.