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The structure analysis of the title compound, C 16 H 19 N 3 O 3 , has been undertaken in order to facilitate the inter­pretation of  1 H and  13 C NMR data and to determine the position of the morpholine residue in this nucleophilic substitution product. The main result is that the morpholine group, with a chair conformation, is connected at the 4-position of the pyridazine ring. The benzene and pyridazine rings make a dihedral angle of 62.17 (5)°. Mol­ecules are linked into a two-dimensional network by non-classical C—H⋯O hydrogen bonds, in which O atoms serve as double or triple acceptors.

1-Methyl-2-(4-methylphenyl)-4-morpholinopyridazine-3,6(1H,2H)-dione