David Emil Neumann (born October 5, 1941) is a politician in the Canadian province of Ontario. He was the mayor of Brantford from 1980 to 1987 and served in the Legislative Assembly of Ontario as a Liberal from 1987 to 1990. After several years out of politics, he was elected as a city councillor for Brantford's fifth ward in the 2010 municipal election. He retired from the Brantford City Council in 2018.