Doyle L. Niemann (March 19, 1947 – May 1, 2024) was an American prosecutor, public administrator, and politician who represented District 47 in the Maryland House of Delegates from 2003 to 2015.

An Assistant State's Attorney for Prince George's County since 1998, Delegate Niemann specialized in prosecuting economic and white-collar crimes.

He previously served on the Mount Rainier City Council (1983–1987), the Maryland Democratic Committee (1986–1990), and the Prince George's County Board of Education (1996–2002).

PHIFA was one of the very early attempts by a state to end what is commonly known as a foreclosure rescue scheme (or fraud).

In 2008, Delegate Niemann was once again a leader in the House in the successful fight to strengthen the standards for mortgage brokers, to make substantial changes to the Maryland procedures for foreclosures that protected consumers, and to improve PHIFA.