Cheng (also known as Jeng, Chieng) is a Mon–Khmer language of southern Laos. Chazée (1999:95) estimates the population at 5,500, while the 1995 Laotian census places the Cheng population at 6,511. Cheng is very closely related to Oi but the speakers consider themselves to be a distinct ethnic group from the Oi (Sidwell 2003).The Cheng live mostly along the banks of the Sekaman River, in and around Ban Fandeng (Phandɛŋ).