The molecule of the title compound, [NaNi(C 18H 18N 2O 4)(ClO 4)(CH 3OH)], is almost planar, the maximum deviation from the molecular plane being 5.3 (1) Å. The Ni 2+ ion is N 2O 2 coordinated by the Schiff base ligand, leading to a slightly distorted square-planar environment. The Na atom is chelated by the four O atoms of the Schiff base ligand and is coordinated by the O atoms of a methanol ligand and a perchlorate anion. The perchlorate ion is disordered over two sites with occupancies 0.723 (12):0.277 (12).