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In the molecular structure of the title compound, C20H15NO2, the isoindolin-1-one unit is planar, the maximum atomic deviation being 0.048 (2) Å. The two biphenyl rings are twisted with respect to the isoindolin-1-one plane, making dihedral angles of 33.21 (9) and 33.34 (9)°. The two benzene rings of the biphenyl substituent are oriented at a dihedral angle of 35.43 (11)° to each other. An intramolecular O—H...O interaction occurs and intermolecular C—H...O hydrogen bonding is present in the crystal structure.