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With the exception of the terminal benzene rings, the atoms in the title compound, C 20 H 18 ClN 3 O 2 , are approximately coplanar (r.m.s. deviation = 0.0495 Å). The benzene/chloro­benzene rings form dihedral angles of 3.02 (4) and 41.59 (5)°, respectively, with this plane. The hy­droxy, amino and carbonyl groups all lie to the same side of the mol­ecule, enabling the formation of intra­molecular O—H⋯O and N—H⋯O hydrogen bonds that close  S (6) rings. The configuration about the 2-butene bond is  Z . Supra­molecular chains mediated by C—H⋯Cl inter­actions and aligned along the  c  axis are found in the crystal packing. These assemble into layers that are connected by weak π–π inter­actions between centrosymmetrically related chloro­benzene rings [3.8156 (9) Å].

(2Z)-3-(4-Chloroanilino)-1-(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)but-2-en-1-one