Alexander of Serbia may refer to:
- Alexander Karađorđević, Prince of Serbia (1806–1885)
- Alexander I of Serbia (1876–1903), King of Serbia
- Alexander I of Yugoslavia (1888–1934), King of the Kingdom of Serbs, Croats and Slovenes, later the Kingdom of Yugoslavia
- Prince Alexander of Yugoslavia (1924–2016), son of Prince-Regent Paul
- Alexander, Crown Prince of Yugoslavia (born 1945), current pretender
- Prince Alexander of Yugoslavia (born 1982), son of Crown Prince Alexander