The list includes all individuals who were first in line to the throne of Italy, either as heir apparent or as heir presumptive, since 1861. Those who actually succeeded to the throne are shown in bold.
| Monarch | Heir | Relationship to monarch | Became heir (Date; Reason) | Ceased to be heir (Date; Reason) | Next in line of succession | |
|---|---|---|---|---|---|---|
| Vittorio Emanuele II | Prince Umberto, Prince of Piedmont | Son | 17 March 1861 Father proclaimed king of Italy | 9 January 1878 Father died, became king | Prince Amedeo, Duke of Aosta, 1861–1869, brother | |
| Prince Vittorio Emanuele, Prince of Naples, 1869–1878, son | ||||||
| Umberto I | Son | 9 January 1878 Father became king | 29 July 1900 Father assassinated, became king | Prince Amedeo, Duke of Aosta, 1878–1890, uncle | ||
| Prince Emanuele Filiberto, Duke of Aosta, 1890–1900, first cousin | ||||||
| Prince Emanuele Filiberto, Duke of Aosta | First cousin | 29 July 1900 | 15 September 1904 Son born to king | Prince Amedeo, Duke of Apulia, son | ||
| Prince Umberto, Prince of Piedmont | Son | 15 September 1904 Born | 9 May 1946 Father abdicated, became king | |||
| Prince Amedeo, Duke of Aosta, 1931–1937, second cousin | ||||||
| Prince Vittorio Emanuele, Prince of Naples, 1937–1946, son | ||||||
| Umberto II | Prince Vittorio Emanuele, Prince of Naples | Son | 9 May 1946 Father became king | 12 June 1946 | Prince Aimone, Duke of Aosta, second cousin once removed |