The 1:1 adduct of benzylamine with bis(difluoroborondimethylglyoximato)nickel(II) is orthorhombic, space group Pbcn, with a = 19.563(12), b = 10.087(7), c = 21.719(11) Å, Z = 8. The structure was refined to R = 0.077 for 1661 photographic reflexions. The complex is dimeric [Ni⋯Ni 3.873(3) Å] with the two monomer units related by a crystallographic two-fold axis. Each Ni atom has a square-based pyramidal environment formed from four N atoms of the closely planar macrocycle [average, NN 1.859(9) Å, NNiN 82.3(4) and 96.0(4)°] and the benzylamine N atom [NiN 2.286(11) Å]. The Ni atom is displaced 0.23 Å out of the N4 equatorial plane towards the apical N atom. The perpendicular distance between the two macrocylic planes of the dimer is 3.30 Å and the C⋯O intermolecular contacts in the dimer are 3.24-3.37 Å.