The Tausūg, are an ethnic group of the Philippines and Malaysia. A small population can also be found in the northern part of North Kalimantan, Indonesia. The Tausūg are part of the wider political identity of Muslim Filipinos of western Mindanao, the Sulu archipelago, and southern Palawan, collectively referred to as the Moro people. The Tausugs originally had an independent state known as the Sultanate of Sulu, which once exercised sovereignty over the present day provinces of Basilan, Palawan, Sulu, Tawi-Tawi, Zamboanga City, North Kalimantan and the eastern part of the Malaysian state of Sabah. They are also known in the Malay language as Suluk.

Islam in the Philippines is the second largest religion in the country, and the faith was the first-recorded monotheistic religion in the Philippines. Historically, Islam reached the Philippine archipelago in the 14th century, through contact with Muslim Malay and Arab merchants along Southeast Asian trade networks, in addition to Yemeni missionaries from the tribe of Alawi of Yemen from the Persian Gulf, southern India, and their followers from several sultanates in the wider Malay Archipelago. The first missionaries then followed in the late 14th and early 15th centuries. They facilitated the formation of sultanates and conquests in mainland Mindanao and Sulu. Those who converted to Islam came to be known as the Moros, with Muslim conquest reaching as far as Tondo that was later supplanted by Bruneian Empire vassal-state of Maynila.