Ivan Janša (born 17 September 1958), baptized and best known as Janez Janša, is a Slovenian politician who has been Prime Minister of Slovenia since February 2012. He served as Prime Minister from 2004 to 2008, and has led the Slovenian Democratic Party since 1993. Janša was Minister of Defense from 1990 to 1994, holding that post during the Slovenian War of Independence (June–July 1991).

Born to a Roman Catholic working-class family of Grosuplje, he was called Janez (a version of the same name, known as John in English) since childhood. His father was a member of the Slovenian Home Guard from Dobrova near Ljubljana who had escaped Communist retaliation due to his young age. Janez graduated from the University of Ljubljana with a degree in Defence Studies in 1982, and became a trainee in the Defence Secretariate of the Socialist Republic of Slovenia. In his younger years, he was a member of the League of Communists and one of the leaders of its youth wing. He became president of the Committee for Basic People's Defence and Social Self-Protection of the Alliance of Socialist Youth of Slovenia (ZSMS).