Sadr al-Din (, ) may refer to:
Sadr al-Din al-Qunawi (died 1274), Persian Sufi writer
Sadr al-Dīn Mūsā (1305–1391), leader of the Safaviya order
Sadr ad-Dīn Abu'l Ḥasan ʿAlī Ibn Abi al-Izz (1331–1390), Syrian Sunni Hanafi jurist and theologian Pir Sadardin (14th century), Persian founder of Khoja Ismaili sect Ṣadr ad-Dīn Muḥammad Shīrāzī, or just Mulla Sadra (c. 1571–1636), Persian Shia Islamic philosopher Sadreddin Nizamettinovich Maksudov, or Sadri Maksudi Arsal (1878–1957), Tatar and Turkish statesman Sadriddin Ayni (1878–1954), Tajik poet, journalist, historian Sadr al-Din bin Saleh (late 19th century), Twelver Shi'a religious scholar Sadr al-Din al-Sadr (1882–1954) Iraqi ayatollah Sadr-ud-Din (Lahore Ahmadiyya leader) (died 1981), second Emir of the Lahore Ahmadiyya Movement, active in Berlin Mehmet Sadrettin Alışık, or just Sadri Alışık (1925–1995), Turkish film actor Prince Sadruddin Aga Khan (1933–2003), French Muslim United Nations official Ali Sadreddine Bayanouni (born 1938), Syrian active in the Muslim Brotherhood Saddaruddin Hashwani (born 1940), Pakistani businessman