Saadi or Sadi is a surname. It may refer to one of the following:

• Saadi dynasty, a dynasty of Morocco
• Saadi (poet), medieval Persian Sufi poet
• Hussein Hanoun al-Saadi, Iraqi interpreter and pilot
• Ramón Saadi, Argentine politician, son of Vicente Saadi
• Suhayl Saadi, Scottish author
• Vicente Saadi (1913-1988), Argentine politician
• Youcef Saadi, Algerian professional soccer player

• Abd ar-Rahman ibn Nasir as-Sa'di, Islamic scholar of fiqh and tafsir
• Amir Hamudi Hasan al-Sadi (or al-Saadi), Iraqi chemical engineer and weapons developer
• Marie François Sadi Carnot, former president of France
• Nicolas Léonard Sadi Carnot, French physicist
• Saïd Sadi, Algerian political activist

Saadi as a given name:

• Al-Saadi Qadhafi, Libyan professional soccer player
• Saadi Simawe, Iraqi-American author, teacher, and translator
• Saadi Yacef, Algerian politician
• Saadi Youssef, Iraqi writer and publisher

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