Chamarajanagar is a district in southern Karnataka, India, bordering Erode District of Tamil Nadu and Wayanad District of Kerala. The district was created after the larger Mysore district was split into the new Mysore district and the current Chamrajnagar district.

The District capital is the city of Chamarajanagar. The administrative units of districts in south India are known as taluks. The taluks of Chamarajanagar include Chamarajanagar taluk, Yelandur taluk, Kollegal taluk, and Gundalpet taluk. Many languages are spoken within the district. Kannada being the state language of Karnataka, is the main language in Chamarajanagar district. Tamil is a minor language within the district but of great importance in many areas within the district. Kollegal taluk has a great deal of Tamils, and was originally part of the Tamil Nadu state, in the Salem District.