Al-Malik al-Mansur Sayf ad-Din Abu Bakr (Arabic: الملك المنصور سيف الدين أبو بكر‎‎), better known as al-Mansur Abu Bakr (Arabic: المنصور أبو بكر‎‎), (ca. 1321 – November 1341) was the Bahri Mamluk sultan in 1341. From an early age, Abu Bakr received military training in the desert town of al-Karak. His father, Sultan an-Nasir Muhammad (r. 1310–41), groomed him as a potential successor to the throne and made him an emir in 1335. He was consistently promoted in the following years, becoming the na'ib (governor) of al-Karak in 1339. In June 1341, he became sultan, the first of several sons of an-Nasir Muhammad to accede the throne. However, his reign was short-lived; in August, Abu Bakr was deposed and arrested by his father's senior emir, Qawsun. Abu Bakr was imprisoned in the Upper Egyptian city of Qus, along with several of his brothers, and executed on Qawsun's orders two months later. He was formally succeeded by his younger half-brother, al-Ashraf Kujuk, but Qawsun was left as the strongman of the sultanate.

Abu Bakr was born around 1321 to his sultan father an-Nasir Muhammad (r. 1310–1341) and his concubine mother, Narjis. Narjis also gave birth to Abu Bakr's younger full brothers Ramadan (died 1343) and Yusuf (died 1346). Information about Abu Bakr's early childhood is unavailable in the Mamluk sources. The first mention of Abu Bakr came in 1332. At that time, Abu Bakr had been sent to the desert fortress of al-Karak to join his half-brothers Ahmad and Ibrahim in their military training. Also during that year, Abu Bakr left al-Karak to accompany his father and half-brothers Anuk and Ahmad at al-Aqaba and from there to Mecca to perform the Hajj pilgrimage. However, an-Nasir Muhammad had them return to al-Karak before the trek to Mecca.

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