Chalsa is a former village development committee in Achham District in the Seti Zone of western Nepal. At the time of the 1991 Nepal census, the village had a population of 1721 living in 289 houses. At the time of the 2001 Nepal census, the population was 2142, of which 26% was literate. Chalsa now is part of Kamalbazar Municipality which was established in 2014.