Sayyid Abubakr bin Shaikh Al-Kaff KBE (Arabic: أبو بكر بن شيخ الكاف; c. 1890–1965) was a Yemeni philanthropist known for assisting Harold Ingrams in pacifying Hadhramaut.

[2] Al-Kaff helped to finance the construction of a road in Hadhramaut from the interior to the coast which included compensating local tribesmen for the loss of earnings from their camel trains due to the rise of motor vehicles.

[2] In 1936, Al-Kaff assisted British colonial administrator Harold Ingrams in brokering a three year truce between warring Qu'aiti and Kathiri tribes.

[2] Ingrams mentions him in his 1942 book Arabia and the Isles in which he describes Al-Kaf as being "in a class by himself, but, although his holy descent no doubt increased his influence, his claim to fame rests rather on his own personality and character".

[4] He added that they "were total allies and he played no part with the general body of Seiyids who had a traditional vested interest in the continuation of feuds".