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The title compound, C18H12N2O2·0.5H2O, was prepared by the reaction of 1,4-phenylenediamine with 1,8-naphthalic anhydride in refluxing dimethylformamide. The structure is stabilized by N—H...O and O—H...O hydrogen bonds. There are π–π stacking interactions [centroid-centroid distances of 3.718 (2), 3.510 (2) and 3.546 (2) Å] and C—H...π interactions between the molecules. The water molecule lies on a twofold rotation axis. Its two H atoms are disordered equally over two positions.