Saadi or Sadi may refer to:
- geography
- Sədi, village in Azerbaijan
- Sadi, Nepal
- family name
- Saadi dynasty, a dynasty of Morocco
- Saadi (poet), medieval Persian Sufi poet
- Dheyaa al-Saadi, Iraqi lawyer
- 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
- given name
- Al-Saadi Gaddafi, Libyan professional soccer player
- Saadi Simawe, Iraqi-American author, teacher, and translator
- Saadi Yacef, Algerian politician
- Saadi Youssef, Iraqi writer and publisher