The 1:1 adduct of phenazine with bis(difluoroborondimethylglyoximato)nickel(II) is monoclinic, space group P21/c, a = 9.130(9), b = 8.031(7), c = 15.492(13) Å, β = 91.20(5)°, Z = 2. The structure was refined to R = 0.095 for 1571 photographic reflexions by full-matrix least-squares methods. The planar macrocycle [average Ni-N 1.850(7) Å, N-Ni-N 82.3(4)°] and phenazine molecules each have a space group imposed centre of symmetry, with the closet non-bonded contacts to the nickel atom being the phenazine N atoms at 3.38 Å. Close intermolecular distances indicate π-π interactions which give rise to two sets of alternatively stacked chains directed along b. This stacking arrangement is such that the molecules lie on the (112) and (122) series of planes, which intersect at 67.7° and have 3.32 Å separations. The intermolecular relationship and stacking pattern each closely resemble that of the anthracene adduct previously described.