Sai Mun may refer to:
Sai Mun District, a district (amphoe) in Yasothon Province, Thailand Sai Mun Subdistrict Sai Mun District Sai Mun Subdistrict in Nam Phong District, Khon Kaen, Thailand Sai Mun, Chiang Mai, a subdistrict (tambon) in San Kamphaeng District, Chiang Mai, Thailand Sai Mun Subdistrict in Ongkharak District, Nakhon Nayok, Thailand Sai Mun Subdistrict in Sawang Daen Din District, Sakon Nakhon, Thailand Sai Mun Subdistrict in Phibun Mangsahan District, Ubon Ratchathani, Thailand