Arthur Ernest Ewert (1890-1959) was a German communist political activist and functionary of the Communist International (Comintern). Ewert is best remembered as an official Comintern representative to the United States, China, Argentina, and Brazil during the late 1920s and 1930s. After being subjected to torture and sentenced to 13 years in prison for his political activity in Brazil, Ewert lost his sanity. He was granted amnesty in May 1945 and ultimately returned to East Germany, where he lived out the rest of his life in a series of medical facilities.