Mon State is an administrative division of Myanmar. It lies between Kayin State to the east, the Andaman Sea to the west, Bago Region to the north and Tanintharyi Region to the south, also having a short border with Thailand's Kanchanaburi Province at its south-eastern tip. The land area is 12,155 km2 (4,693 sq mi). The Dawna Range, running along the eastern side of the state in a NNW–SSE direction, forms a natural border with Kayin State. Mon State includes some small islands, such as Kalegauk, Wa Kyun and Kyungyi Island, along its 566 km (352 mi) of coastline. The state's capital is Mawlamyine.

The Mon language is an Austroasiatic language spoken by the Mon people. Mon, like the related Khmer language, but unlike most languages in mainland Southeast Asia, is not tonal. The Mon language is a recognised indigenous language in Myanmar as well as a recognised indigenous language of Thailand.