Darcy G. Richardson (born December 6, 1955) is an American self-published author, amateur historian, blogger and political activist.

In the 2012 presidential election, Richardson is the first candidate that has filed to challenge incumbent Barack Obama for the Democratic nomination for president of the United States in New Hampshire and other states.

Richardson is the author of A Nation Divided: The 1968 Presidential Campaign, published in 2002. The book describes in detail the "Clean for Gene" phenomenon that led to President Lyndon B. Johnson's startling withdrawal from the race and Robert F. Kennedy's opportunistic last-minute candidacy, as well as the campaigns of Republican Richard M. Nixon and others. He has also authored four books of a planned seven volume series on the history of third party politics in the United States, with a heavy focus on progressive movements. All of his books are self-published through iUniverse. The first volume, "Others: Third-Party Politics From the Nation's Founding to the Rise and Fall of the Greenback-Labor Party" earned a Choice magazine Outstanding Academic Title (OAT) award for 2005.^{[unreliable source?]}