Banyumas in the southwestern part of Central Java province in Indonesia. Its capital is the town of Purwokerto. It covers an area of 1,327.59 km², and had a population of 1,554,527 at the 2010 Census and 1,776,918 at the 2020 Census.
The term Banyumasan is also used as an adjective referring to the culture, language and peoples of the wider Banyumas area, equivalent to the pre-independence Banyumas Residency. The language of Banyumasan is of Austronesian origin, and is usually considered to be a dialect of Javanese.