John Daniel Ehrlichman (March 20, 1925 – February 14, 1999) was an American lawyer who served as White House Counsel and Assistant to the President for Domestic Affairs under President Richard Nixon. Ehrlichman was an important influence on Nixon's domestic policy, coaching him on issues and enlisting his support for environmental initiatives. Ehrlichman was a key figure in events leading to the Watergate break-in and the ensuing Watergate scandal, for which he was convicted of conspiracy, obstruction of justice, and perjury, and served a year and a half in prison.