Oscar Rotter (b. 21 July, 1865), also with the German spelling Oskar Rotter, was a German-born New York physician and proponent of free love and contraception. Rotter's books included The Sexes and Love in Freedom and Jealousy, the Foe of Freedom,[1] and he published articles on free love, rebutting the views of Lucy Parsons.[2] Rotter was also a driving force in the medico-economic movement, an early effort to address the economic pressures on the medical profession and pharmaceutical industry.[3]