Al-Muzaffar Sayf ad-Din Hajji ibn Muhammad ibn Qalawun, better known as al-Muzaffar Hajji, (1331–December 1347) was the Bahri Mamluk sultan of Egypt and the sixth son of an-Nasir Muhammad (d. 1341) to hold office, ruling from September 1346 and December 1347. He was known for his love of sports and pigeon racing, acts which led to frustration among the senior Mamluk emirs who believed he neglected the duties of office and spent extravagant sums on gambling. His reign ended when he was killed in a confrontation with Mamluk conspirators outside of Cairo.

Al-Muzaffar Hajji was born "al-Malik al-Muzaffar Hajji" in 1331. The appellation "al-Malik", which means "king" in Arabic, was rare among the sons of Mamluk sultans at birth and was typically given at the accession to the sultanate. Al-Muzaffar Hajji was a son of the long-reigning Sultan an-Nasir Muhammad and one of his concubines, whose name is not provided by the Mamluk-era sources. He married a daughter of Emir Tankiz al-Husami on 15 January 1347 and had one son with her, Muhammad (d. 1398), who became sultan in 1361–1363. Al-Muzaffar Hajji had a second son named Ahmad (d. 1381) with another woman.

Al-Muzaffar Hajji was the sixth of the an-Nasir Muhammad's sons to serve as sultan following an-Nasir Muhammad's death in 1341. Al-Muzaffar Hajji's accession to the sultanate came after the death of his brother and predecessor al-Kamil Sha'ban in September 1346. Like with his other brothers, despite the accession pacts made with the leading Mamluk emirs, al-Muzaffar Hajji's rule was in effect a power center rivaling the Mamluk establishment, which consisted of the powerful emirs and mamluks of an-Nasir Muhammad. Al-Muzaffar Hajji married the daughter of the well-known and long-reigning Mamluk viceroy of Syria, Tankiz (d. 1340) in 1346.

Al-Muzaffar Hajji was known for his affection of the commoners and engaging in sports, such as wrestling wearing only professional leather trousers, stick fighting, polo and pigeon racing. In 1347, the leading Mamluk emirs of the citadel, frustrated at al-Muzaffar Hajji's extravagance and apparent neglect of duties, expelled an African slave girl named Ittifaq that al-Muzaffar Hajji had preoccupied his time with and secretly married, from the citadel. However, al-Muzaffar Hajji's interest in pigeons became another source of frustration with the senior emirs. They were particularly bothered by his frequent distribution of high sums in gold and pearls to pigeon racers and his high-stakes bets. After his senior emirs raised the issue with him, al-Muzaffar Hajji became enraged and killed all of his pigeons one-by-one as a warning to his emirs that they could meet the same fate.

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