| class="wikitable" style="font-size:95%"
|+Heirs to the Belgian throne
! Monarch
! Heir
! Relationship
to monarch
! Became heir
(Date; Reason)
! Ceased to be heir
(Date; Reason)
! Next in line of succession |
| rowspan="6"|Leopold I
| colspan="5" align="center"|None, 1831–1833 |
| Crown Prince Louis Philippe
| Son
| 24 July 1833
Born
| 16 May 1834
Died
| None |
| colspan="5" align="center"|None, 1834–1835 |
| rowspan="3"|Prince Leopold, Duke of Brabant
| rowspan="3"|Son
| rowspan="3"|9 April 1835
Born
| rowspan="3"|17 December 1865
Father died, became king
| None, 1835–1837 |
| Prince Philippe, Count of Flanders, 1837–1859, brother |
| Prince Leopold, Count of Hainaut, 1859–1865, son |
| rowspan="5"|Leopold II
| Prince Leopold, Duke of Brabant[{{Cite web |title=Prince Léopold, Duke of Brabant |url=http://www.19thcenturyphotos.com/Prince-Léopold,-Duke-of-Brabant-126873.htm |access-date=2022-07-28 |website=Library of Nineteenth-Century Photography |language=en}}]
| Son
| 17 December 1865
Father became king
| 22 January 1869
Died
| Prince Philippe, Count of Flanders, uncle |
| rowspan="3"|Prince Philippe, Count of Flanders
| rowspan="3"|Brother
| rowspan="3"|22 January 1869
Nephew died
| rowspan="3"|17 November 1905
Died
| None, 1869 |
| Prince Baudouin, 1869–1891, son |
| Prince Albert, 1891–1905, son |
Prince Albert[{{Cite web |title=Albert I {{!}} king of Belgium {{!}} Britannica |url=https://www.britannica.com/biography/Albert-I-king-of-Belgium |access-date=2022-07-28 |website=www.britannica.com |language=en}}]
| Nephew
| 17 November 1905
Father died
| 23 December 1909
Uncle died, became king
| Prince Leopold, son |
| rowspan="2"|Albert I
| rowspan="2"|Prince Leopold, Duke of Brabant[{{Cite web |title=Leopold III {{!}} king of Belgium {{!}} Britannica |url=https://www.britannica.com/biography/Leopold-III-king-of-Belgium |access-date=2022-07-28 |website=www.britannica.com |language=en}}]
| rowspan="2"|Son
| rowspan="2"|23 December 1909;
Father became king
| rowspan="2"|23 February 1934;
Father died, became king
| Prince Charles, Count of Flanders, 1909–1930, brother |
| Prince Baudouin, Count of Hainaut, 1930–1934, son |
| rowspan="2"|{{nowrap|Leopold III}}
| rowspan="2"|Prince Baudouin, Duke of Brabant[{{Cite web |title=King Baudouin |url=https://www.monarchie.be/ |access-date=2022-07-28 |website=The Belgian Monarchy |language=en}}]
| rowspan="2"|Son
| rowspan="2"|23 February 1934;
Father became king
| rowspan="2"|17 July 1951;
{{nowrap|Father abdicated, became king}}
| Prince Charles, Count of Flanders, 1934, uncle |
| Prince Albert, Prince of Liège, 1934–1951, brother |
| rowspan="2"|Baudouin
| rowspan="2"|Prince Albert, Prince of Liège[{{Cite web |title=Albert II {{!}} king of Belgium {{!}} Britannica |url=https://www.britannica.com/biography/Albert-II-king-of-Belgium |access-date=2022-07-28 |website=www.britannica.com |language=en}}]
| rowspan="2"|Brother
| rowspan="2"|17 July 1951;
{{nowrap|Brother became king}}
| rowspan="2"|9 August 1993;
Brother died, became king
| Prince Charles, Count of Flanders, 1951–1960, uncle |
| Prince Philippe, 1960–1993, son |
| rowspan="2"|Albert II
| rowspan="2"|Prince Philippe, Duke of Brabant[{{Cite web |title=The King |url=https://www.monarchie.be/ |access-date=2022-07-28 |website=The Belgian Monarchy |language=en}}]
| rowspan="2"|Son
| rowspan="2"|9 August 1993;
Father became king
| rowspan="2"|21 July 2013;
Father abdicated, became king
| {{nowrap|Princess Astrid, Archduchess of Austria-Este, 1993–2001, sister}} |
| Princess Elisabeth, 2001–2013, daughter |
| Philippe
| {{nowrap|Princess Elisabeth, Duchess of Brabant[{{Cite web |title=Princess Elisabeth, Duchess of Brabant |url=https://www.monarchie.be/ |access-date=2022-07-28 |website=The Belgian Monarchy |language=en}}]}}
| Daughter
| 21 July 2013;
Father became king
| style="text-align: center;"|Incumbent
| Prince Gabriel, brother |