Najm al-Din (), also transliterated Najm ad-Din, Najmuddin, etc., is a male given name of Arabic origin. It may refer to:
People Najm al-Din Ayyub (died 1173), Kurdish soldier, father of Saladin Umara al-Yamani (1121–1174), Yemeni poet and historian Najm al-Din al-Khabushani (1116–1191), Persian Shafi'i jurist Najmuddin Kubra (1145–1221), Persian Sufi philosopher Najm al-Din Razi (1177–1256), Persian Sufi philosopher Al-Malik as-Salih Najm al-Din Ayyub, or just As-Salih Ayyub (1205–1249), Ayyubid ruler of Egypt Najm al-Dīn al-Qazwīnī al-Kātibī (died 1276), Persian Islamic philosopher and logician of the Shafi`i school Najm al-Din Mahmud ibn Ilyas al-Shirazi (died 1330), Persian physician Najimuddin Ali Khan (1750–1766), Nawab of Bengal Najmuddin of Gotzo (1859–1925), North Caucasian religious, military and political anticommunist leader Jumeken Najimedenov (1935–1983), Kazakh composer Najmuddin Shaikh (1939–2025), Pakistani diplomat Najmaldin Karim (1949–2020), Governor of Kirkuk Province Najmuddin Faraj Ahmad, known as Mullah Krekar (born 1956), exiled Kurdish politician Najmadin Shukr Rauf (1957–1985), Kurdish soldier Suzan Najm Aldeen (born 1966), Syrian actress Nagmeldin Ali Abubakr (born 1986), Sudanese athlete Najm Eldin Abdullah (born 1987), Sudanese footballer Najmiddin Jalolov (1972–2009), Uzbek Islamic fighter Najmiddin Kosimkhojiev (born 2004), Uzbekistani taekwondo practitioner Najmuddin Khan, Pakistani politician
Places Mazraeh-ye Khodaqoli Najam ol Din, village in Iran
See also Necmettin