| rowspan="2" | 1
| rowspan="2" | [[Charles Rogier]]
| rowspan="2" | [[ImageFile:CharlesrogierCharles Rogier.jpg|60px88x88px]]
| 12 August 1847
| 31 October 1852
| rowspan="2" | 2
| rowspan="2" | [[Wilfried Martens]]
| rowspan="2" | [[ImageFile:Wilfried Martens 1982 (cropped).jpg|60px83x83px]]
| 3 April 1979
| 31 March 1981
| rowspan="2" | 3
| rowspan="2" | [[Paul de Smet de Naeyer]]
| rowspan="2" | [[ImageFile:Karel De Kesel - Portrait of Count Paul-Joseph de Smet de Naeyer - 2005-P - Museum of Fine Arts Ghent (MSK).jpg|60px100x100px]]
| 25 February 1896
| 24 January 1899
| rowspan="3" | 4
| rowspan="3" | [[Barthélémy de Theux de Meylandt]]
| rowspan="3" | [[ImageFile:Barthélemy de De-Theux (03)-de-Meylandt.jpg|60px83x83px]]
| 4 August 1834
| 18 April 1840
| 5
| [[Auguste Marie François Beernaert|Auguste Beernaert]]
| [[ImageFile:Auguste Beernaert(03).gifjpg|60px84x84px]]
| 26 October 1884
| 26 March 1894
| rowspan="2" | 6
| rowspan="2" | [[Charles de Broqueville]]
| rowspan="2" | [[File:M 37 4 CharlesComte de BrocquevilleBroqueville.jpg|60px81x81px]]
| 17 June 1911
| 1 June 1918
| 7
| [[Guy Verhofstadt]]
| [[File:Members debate and vote on the EU-UK withdrawal agreement (49459809218) (cropped 2).jpg|95x95px]]
| [[Image:Guy Verhofstadt EP press conference 3.jpg|60px]]
| 12 July 1999
| 20 March 2008
| rowspan="2" | 8
| rowspan="2" | [[Walthère Frère-Orban]]
| rowspan="2" | [[ImageFile:FrèreOrbanWalthère Frère-Orban (1812-1896).jpg|60px73x73px]]
| 3 January 1868
| 2 July 1870
| rowspan="3" | 9
| rowspan="3" | [[Gaston Eyskens]]
| rowspan="3" | [[File:Gaston Eyskens cropped(1969).jpg|60px80x80px]]
| 11 August 1949
| 8 June 1950
| 11
| [[Hubert Pierlot]]
| [[ImageFile:PierlotHubert sturgesPierlot (cropped)1947.jpg|60px71x71px]]
| 22 February 1939
| 12 February 1945
| 13
| [[Henri Jaspar]]
| [[ImageFile:Henri Jaspar 1921 (cropped).jpg|60px90x90px]]
| 20 May 1926
| 6 June 1931
| 14
| [[Charles Michel]]
| [[File:Charles Michel (2018-01-3152098728061) (cropped).jpg|60px84x84px]]
| 11 October 2014
| 27 October 2019
| 16
| [[Jean-Baptiste Nothomb]]
| [[ImageFile:JeanPortrait de Jean-Baptiste Nothomb (02)par Jean-Baptiste Bernard.jpg|60px69x69px]]
| 13 April 1841
| 30 July 1845
| 17
| [[Théo Lefèvre]]
| [[File:TheoThéo LefevreLefèvre cropped1964b.jpg|60px73x73px]]
| 25 April 1961
| 28 July 1965
| 20
| '''[[Alexander De Croo]]'''
| [[File:Alexander De Croo 2019.jpg|84x84px]]
| [[File:Informal_meeting_of_ministers_responsible_for_development_(FAC)._Arrivals_Alexander_De_Croo_(36766610160)_(cropped2).jpg|60px]]
| '''1 October 2020'''
|–
| 21
| [[Frans Schollaert]]
| [[ImageFile:Frans Schollaert (cropped).jpg|60px90x90px]]
| 9 January 1908
| 17 June 1911
| 23
| [[Elio Di Rupo]]
| [[File:Elio Di Rupo PES-Kongress(2016) 2014(cropped).jpg|60px93x93px]]
| 6 December 2011
| 11 October 2014
| rowspan="2" | 24
| rowspan="2" | [[Yves Leterme]]
| rowspan="2" | [[ImageFile:Yves Leterme 01campagne foto cropped.jpg|60px79x79px]]
| 20 March 2008
| 30 December 2008
| rowspan="2" | 25
| rowspan="2" | [[Paul Vanden Boeynants]]
| rowspan="2" | [[File:Paul Vanden Boeynants 1966.jpg|60px72x72px]]
| 19 March 1966
| 17 July 1968
| 26
| [[Paul van Zeeland]]
| [[File:Paul van Zeeland, 1937(1-E-1585) (cropped).jpg|60px81x81px]]
| 25 March 1935
| 24 November 1937
| 33
| [[Jules d'Anethan]]
| [[ImageFile:Portret van baron Jules Joseph d'Anethan, voorzitter van de Senaat (1884-1885).jpg|60px74x74px]]
| 2 July 1870
| 7 December 1871
| 53
| [[Étienne Constantin de Gerlache|Étienne de Gerlache]]
| [[ImageFile:EtiennedeGerlacheE. de gerlache.jpg|60px76x76px]]
| 27 February 1831
| 10 March 1831
|