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Sungai Besar (Jawi: سوڠاي بسر) is the principal town ofSabak Bernam District,Selangor,Malaysia.
Sungai Besar's population is estimated to be around 23,000 of which 43% are within 20 to 55 years old. From that total, around 73 percent are Malays (Banjar, Jawa, and Kampar descents), Chinese (23%) and Indian (3.5%).[1]
Majority of its people are working as farmers and fisherman, as well as working in coconut, padi planting, andpalm oil plantations. The town becomes the centre of administration for Sabak Bernam district as many government offices and local authority centre are located there.

The small village ofSungai Lias is within the town.
3°40′N100°59′E / 3.667°N 100.983°E /3.667; 100.983