Izz al-Din (Arabic: عز الدين) "Glory of the Deen (religion)", may refer to
- Izz al-Din Usama (12th century), Ayyubid emir
- 'Izz al-Dīn Qilij Arslān bin Mas'ūd, or Kilij Arslan II (died 1192), Seljuq Sultan of Rum
- Izz ad-Din Mas'ud (died 1193), Zangi emir of Mosul
- 'Izz al-Dīn Kaykā'ũs bin Kaykhusraw, or Kaykaus I (died 1220), Seljuq Sultan of Rum
- Ali 'Izz al-Din Ibn al-Athir al-Jazari, also known as Ali ibn al-Athir (1160–1233), Muslim historian
- Izz al-Din Aybak (died 1257), Mamluk sultan of Egypt
- Izz al-Din `Abd al-Hamid ibn Hibat-Allah ibn Abi al-Hadid al-Mu`tazili al Madaini (died 1258), Shia Mu`tazili Islamic scholar and writer
- Izz-ud-din Balban-i-Yuzbaki - Mamluk Governor of Bengal for Mamluk Sultanate (Delhi) from 1257-1259.
- 'Izz al-Dīn Kaykā'ũs bin Kaykhusraw, or Kaykaus II (died ca. 1280), Seljuq Sultan of Rum
- Izz al-Din Aydamir Al-Jaldaki (died 1342), Persian physician and alchemist
- 'Izz al-Din ibn Rukn al-Din Mahmud (died 1382), Mihrabanid malik of Sistan
- Hasan 'Izz ud-din (fl. 1760), king of the Huraa dynasty of the Maldives
- Yusuf Izzettin Efendi (1857–1916), Ottoman prince
- Izz ad-Din al-Qassam (1882–1935), Palestinian Islamic preacher and resistance fighter
- Yusuf Izzuddin Shah of Perak (1890–1963), Sultan of Perak, Malaysia
- Ezzel Dine Zulficar (1919–1963), Egyptian film director
- Azzeddine Laraki (born 1929), Prime Minister of Morocco
- Azzedine Alaia (born 1940), Tunisian fashion designer
- Ezzedine Salim (1943–2004), Iraqi writer and politician
- Ramzy Ezzeldin Ramzy (born 1954), Egyptian politician and diplomat
- Azzedine Amanallah (born 1956), Moroccan footballer
- Ezzeddine Hadj Sassi (born 1962), Tunisian footballer
- Izz El-Deen Sheikh Khalil (ca. 1963 - 2004), Palestinian resistance fighter
- Hassan Izz-Al-Din (born ca. 1963), Lebanese wanted by the United States government
- Azzedine Brahmi (born 1966), Algerian long-distance runner
- Azzedine Sakhri (born 1968), Algerian long-distance runner
- Izzeddine al Mosrati (born 1973), Libyan footballer
- Mansoura Ez-Eldin (born 1976), Egyptian novelist and journalist
- Abu Izzadeen (adopted name) (born 1976), British Muslim activist
- Azzedine Zerdoum (born 1977), Algrian cross-country runner
- Azzedine Benchaïra (born 1978), Algerian footballer
- Azzedine (born 1979), screen name of porn star, model and film actor François Sagat during his debut years at Citébeur studios
- Mohamed Izzadeen (born 1979), Sri Lankan footballer
- Sofiane Azzedine (born 1980), Algerian footballer
- Azzeddine Ourahou (born 1984), Moroccan footballer
- Ezzedin Yacoub Hamed, Egyptian long-jumper
- Salah Ezzedine, Lebanese businessman accused of running a pyramid scheme