Jalal ad-Din (Arabic: جلال الدین ), (also Jalaluddin, and a number of other transliterations into English, also via other languages) is a male Muslim given name of Arabic origin, formed from the name Jalal with the qualification ad-Din. It may refer to, in chronological order:
- Jalal ad-Din Mingburnu (died 1231), last ruler of the Khwarezmid Empire
- Jalal al-Din Muhammad Rumi (1207–1273), Persian poet and Sufi mystic.
- Hazrat Jalaluddin Surkh-Posh Bukhari (ca. 1192 - 1291), Suhrawardiyya Sufi saint
- Jalal ud din Firuz Khilji (died 1296), first Indian ruler of the Delhi sultanate and founder of the Khilji dynasty
- Jalal al-Din Mahmud (died 1352), Mihrabanid king of Sistan
- Jalal ad-Din khan (1380–1412), khan of Golden Horde, son of Tokhtamysh, leader of Lipka Tatars
- Jalaluddin Muhammad Shah (died 1433), ruler of Bengal
- Jalaluddin Fateh Shah (died 1487), ruler of Bengal
- Jalaladdin Davani (1426–1502), Persian philosopher, theologian, jurist and poet
- Imam Jalaluddin Al-Suyuti (ca. 1445 - 1505), Egyptian religious scholar, juristic expert and teacher.
- Jalal ad-Din al-Mahalli, co-author of Tafsir al-Jalalayn.
- Jalaluddin Muhammad Akbar (1542–1605), Mugal Emperor of India
- Jalal al-Din Muhammad al-Isfahani, (fl. 1828), Persian physician
- Jalaluddin Mirza (1864–1876), prince of the Mughal royal family
- Muhammad Jalaluddin Sayeed (born 1920), founding director of NOL
- Jalaluddin Umri (born 1935), Indian Muslim writer
- Jalaluddin Mansur Nuriddin (born 1944), American musician and hip hop pioneer
- Jalaluddin Haqqani (born ca. 1950), Afghan military leader
- Jalal-ud-Din (cricketer) (born 1959), Pakistani cricketer
- Dželaludin Muharemović (born 1970), Bosnian footballer
- Djelaludin Sharityar (born 1983), Afghan-German footballer
- Jalaledin Alimohammadi (born 1990), Iranian footballer
- Jalal Al-Din Taheri, Iranian Islamic theologian
- Jalaleddin Farsi, Iranian politician
- Mir Jalaleddin Kazzazi, Iranian writer
- Jalal al-Din Ali al-Saghir, Iraqi politician
- Jalaluddin Hassan, Malaysian actor