List of prime ministers of Belgium by political affiliation

This article is intended to be a comprehensive list of all prime ministers, grouped by political affiliation.

Thirty-six Christian Democrats have served as prime minister, either as being considered Catholic, or as a member of the Catholic Party, the PSC-CVP, the CVP, or the CD&V.

Twelve Liberals have served as prime minister, either as being considered Liberal, or as a member of the Liberal Party, the VLD, or the MR. Five Social Democrats have served as prime minister, either as a member of the BWP-POB, the BSP-PSB, or the PS.

One Nationalist has served as prime minister as a member of the N-VA.

Étienne de Gerlache , Christian Democrat and first Prime Minister of Belgium
Herman Van Rompuy , a Christian-Democrat, who later became the first permanent European President
Charles Rogier , Liberal and longest-serving Prime Minister
Paul-Henri Spaak , the first Social Democratic Prime Minister