Oswald Chettle Mazengarb (1890-1963) was a New Zealand barrister. His other well-known public appointment was in 1954, by the National government of the time, to chair the Special Committee on Moral Delinquency in Children and Adolescents, otherwise better known as the Mazengarb Report. Oswald Mazengarb also wrote a few legal textbooks. Aside from his legal and judicial careers, he was also a politician, standing for National in the 1935 and 1938 elections, and appointed in 1950 as one of its so-called 'suicide squad' in the Legislative Council.