Bangsamoro Autonomous Region in Muslim Mindanao, officially designated as BARMM, is an administrative region in the Philippines grouped under the Mindanao island group. It covers 5 provinces, namely, Basilan, Lanao del Sur, Maguindanao, Sulu, and Tawi‑Tawi. The regional center is the City of Cotabato.

Its population as determined by the 2020 Census was 4,404,288. This represented 16.78% of the overall population of the Mindanao island group, or 4.04% of the entire population of the Philippines. Based on these figures, the population density is computed at 120 inhabitants per square kilometer or 311 inhabitants per square mile.