John Richard "Jack" Nichols Jr. (March 16, 1938 – May 2, 2005) was an American gay rights activist. He co-founded the Washington, D.C. branch of the Mattachine Society in 1961 with Frank Kameny. He was born in Washington, D.C.. Nichols led the first gay rights march on the White House, in April 1965, and participated in the Annual Reminder pickets at Independence Hall in Philadelphia.