In the title compound, C21H24N2O2Si, the carbonyl group of the heterocyclic ring and the O atom of the silyl ether group are placed toward opposite sides and the tert-butyl and pyridazinone moieties are anti-oriented across the Si-O bond [torsion angle = -168.44 (19)°]. In the crystal, mol-ecules are assembled into inversion dimers through co-operative N-H⋯O hydrogen bonds between the NH groups and O atoms of the pyridazinone rings of neighbouring mol-ecules. The dimers are linked by π-π inter-actions involving adjacent pyridazinone rings [centroid-centroid distance = 3.8095 (19) Å], generating ladder-like chains along the b-axis direction. The chains are further linked into a two-dimensional network parallel to the ab plane through weak C-H⋯π inter-actions.