Mabul (Malay: Pulau Mabul) is a small island off the south-eastern coast of Sabah in Malaysia. The island has been a fishing village since the 1970s. In the 1990s, it first became popular to divers due to its proximity to Sipadan island.
Located 15 km from Sipadan, this 20-hectare piece of land surfaces 2–3 metres above sea level, consists mostly flat grounds and aerial view is oval-shaped. Surrounding it are sandy beaches, perched on the northwest corner of a larger two-square-kilometre reef.
Mabul island is administered as a part of Semporna, Tawau district.