David Emil Neumann (born October 5, 1941 in Montreal, Quebec) is a politician in Ontario, Canada. He was a Liberal member of the Legislative Assembly of Ontario from 1987 to 1990.

Neumann was educated as McMaster University in Hamilton, Ontario, and worked as a secondary school teacher. He was an alderman in the city of Brantford from 1977 to 1980, and served as its mayor from 1980 to 1987.

Neumann first ran for the Ontario legislature in the provincial election of 1971, not for the Liberals but for the New Democratic Party in the riding of Brant. He finished a distant third against Robert Nixon, the Liberal Party leader.

He did not run for the legislature again until the 1987 provincial election, when he defeated NDP candidate Jack Tubman in the riding of Brantford (incumbent Progressive Conservative Phil Gillies finished third). For the next three years, Neumann served as a backbench supporter of the government of David Peterson.

The Liberals were unexpectedly defeated in the 1990 provincial election, and Neumann lost his seat to Brad Ward of the NDP by over 4,000 votes. Neumann had been supported by the Ontario Secondary School Teachers Federation in 1987, but had lost much of this support by 19909. He ran again in the 1995 provincial election, but lost to Progressive Conservative Ron Johnson by 3,327 votes. He has not sought another return to the legislature since this time.

Neumann is now the executive director for the Ontario Association of Adult and Continuing Education School Board Administrators (CESBA).