Najm al-Din Ilghazi ibn Artuq (Arabic: نجم الدين إلغازي ابن أرتوك; died November 8, 1122) was the Turkoman[1] Artukid ruler of Mardin from 1107 to 1122.
His father Artuk Bey was the founder of the Artukid dynasty, and had been appointed governor of Jerusalem by the Seljuq emir Tutush.
As head of the Artukids he made no lasting alliances and frequently switched sides, allying with both fellow Muslims and Christian crusaders whenever he saw fit.
Later that year, Roger of Antioch, Baldwin I of Jerusalem, Pons of Tripoli, and Baldwin II of Edessa defended Antioch against the Seljuq general Bursuq ibn Bursuq (not to be confused with al-Bursuki), with the aid of Ilghazi, Toghtekin of Damascus, and Lulu of Aleppo, all enemies of Bursuk.
In 1121, he made peace with the crusaders, and with supposedly up to 250,000–350,000 troops, including men led by his son-in-law Sadaqah and Sultan Malik of Ganja, he invaded Georgia.
In 1122, Ilghazi and Balak defeated Joscelin I of Edessa and took him prisoner, but Ilgazi died in November of that year at Diyarbekir.
Ibn al-Qalanisi is generally neutral on the character of Ilghazi, and describes only one "disgraceful habit" of the emir: "Now when Ilghazi drank wine and it got the better of him, he habitually remained for several days in a state of intoxication, without recovering his senses sufficiently to take control or to be consulted on any matter or decision."