Sa'd al-Din
Sa'ad al-Din (Arabic: سعد الدين ) also written Saad Eddine or Saadeddine may refer to:
- Sa'd al-Din Köpek (died 1240), court administrator under Seljuq Sultans of Rum
- Sad al-Din Masud ibn Umar ibn Abd Allah al-Taftazani (1322–1390), Persian scholar
- Sa'ad ad-Din II (ruled c. 1400), Somali Sultan of the Ifat Sultanate
- Hoca Sadeddin Efendi (1536—1599), Turkish scholar, official, and historian
- Sa'd al-Din Hu Songshan Chinese Muslim Nationalist Imam of the Yihewani
- Saad Eddin Ibrahim (born 1938), Egyptian-American sociologist and author
- Saadeddine Othmani (born 1956), Moroccan psychiatrist and politician
- Saad ed Deen Rafiq al-Hariri, or just Saad Hariri (born 1970), Prime Minister of Lebanon