Sa'ar served as Aide to the Attorney-General (1995-1997), Aide to the State Attorney (1997-1998), and Secretary to the Government (1999, 2001-2002).
Elected to the Knesset in 2003, he has served as Likud Parliamentary Group Chairman and was an active lobbyist. He was a member of the Constitution, Law and Justice Committee, the House Committee, the Committee for Immigration, Absorption, and Diaspora Affairs, and as Chairman of the Committee on the Status of Women. In the 17th Knesset (2006-2009) he also served as Deputy Speaker of the Knesset.
Gideon Sa'ar was appointed Minister of Education in March 2009.
He is married and the father of two children.