Oreichthys is a genus of tropical barbs found in Thailand, India, Bangladesh, Myanmar (Burma), northern Malay Peninsula, and the Mekong basin in Laos. They are found in ditches, ponds, streams (both highland and lowland) and canals. The genus Oreichthys (Smith 1933) was originally established to receive little fish collected in a small brook on Kao Sabap, an extensive mountain range near Chantaban, Thailand.