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In the title compound, C 17 H 15 ClN 2 O 2 , the benzene rings form dihedral angles of 89.56 (5) and 5.87 (5)° with the mean plane of the pyrazoline ring (r.m.s. deviation = 0.084 Å). The dihedral angle between the two benzene rings is 87.57 (5)°. In the crystal, mol­ecules are linked by O—H⋯O and C—H⋯O hydrogen bonds into a helical chain along the  c  axis. Between the chains weak C—H⋯N and C—H⋯O inter­actions are present. The crystal studied was an inversion twin with a domain ratio of 0.72 (4):0.28 (4).

1-[5-(4-Chlorophenyl)-3-(4-hydroxyphenyl)-4,5-dihydro-1H-pyrazol-1-yl]ethanone