Ivan Janša, baptized and best known as Janez Janša, is a Slovenian politician who served three times as a prime minister of Slovenia, a position he had held from 2004 to 2008, from 2012 to 2013, and from 2020 to 2022. Since 1993, Janša has led the Slovenian Democratic Party, which has emerged as the pre-eminent Slovenian conservative party. Janša lost his fourth bid for prime minister in April 2022, his party defeated by the Freedom Movement party.

The prime minister of Slovenia, officially the president of the Government of the Republic of Slovenia, is the head of the Government of the Republic of Slovenia. There have been nine officeholders since the country gained parliamentary democracy in 1989 and independence in 1991.