Lang Suan

Lang Suan may refer to
 * Lang Suan (town), Chumphon, Thailand
 * Lang Suan District, surrounding the town
 * Lang Suan River, mostly within the district
 * Lang Suan Province, a former Thai province, part of Monthon Surat, abolished in 1932
 * Lang Suan, a street in Bangkok's Pathum Wan District