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There are two structurally similar but crystallographically independent mol­ecules ( A  and  B ) in the asymmetric unit of the title compound, C 21 H 22 N 2 O 2 , which are linked  via  two O—H⋯O hydrogen bonds. An intramolecular O—H⋯O hydrogen bond also occurs in each molecule. In the crystal, the  A  and  B  mol­ecules are further linked through C—H⋯O inter­actions. The benzene ring is twisted at an angle of 69.9 (1) and 83.4 (1)° relative to the 1,4-dihydro­quinoline skeleton in mol­ecules  A  and  B , respectively. Adjacent 1,4-dihydro­quinoline units of mol­ecules  A  are parallel, while mol­ecules  A  and  B  are oriented at an angle of 32.8 (1)°.

3-Hydroxy-1-methyl-2-[4-(piperidin-1-yl)phenyl]quinolin-4(1H)-one