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The title Schiff base compound, C14H11ClN2O3, was prepared by the reaction of 5-chlorosalicylaldehyde and 4-hydroxybenzohydrazide. The molecule exists in a trans configuration with respect to the methylidene group. The dihedral angle between the two benzene rings is 40.1 (2)°. An intramolecular O—H...N hydrogen bond helps to stabilize the molecular conformation. In the crystal structure, molecules are linked into a three-dimensional network by intermolecular N—H...O and O—H...O hydrogen bonds.