The Sandakan District Mosque (Malay: Masjid Daerah Sandakan or also known as Masjid Besar Sim-Sim) is a mosque in Sandakan, Sabah, Malaysia.

Built in 1985 and completed in 1989, it is the main mosque for the district of Sandakan.

[1] In 2016, the mosque was visited by the Crown Prince of Perlis, Tuanku Syed Faizuddin Putra Jamalullail.

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