Mabul (Malay: Pulau Mabul) is a small island near the southeastern coast of Sabah in Malaysia. The island has been a fishing village since the 1970s. After the 1990s, Mabul gained popularity with scuba divers due to its proximity to Sipadan island.

The island is roughly 15 km north of Sipadan, 0.2km² in size, and around 2–3m above sea level. It is located on the northwest of a reef that is ~2 km long.

Mabul island is administered as a part of the Semporna, Tawau district.