Rumbek (Arabic: رمبك) is the capital of Lakes State in the Bahr el Ghazal region of South Sudan.

Rumbek is approximately 377 kilometres (234 mi) by road northwest of Juba, the capital and largest city in the country.

Like most South Sudanese towns, Rumbek suffered significant infrastructural damage during the civil war, in which an estimated 2 million people perished.

Like other parts of South Sudan and the East Sudanian savanna, Rumbek has a tropical savanna climate which borders on a hot semi-arid climate (Köppen Aw bordering on BSh), with a wet season and a dry season and the temperature being hot year-round.

Rumbek receives 847.7 millimetres (33.37 in) of rain over 77.1 precipitation days, with a distinct wet and dry season like most tropical savanna climates.