Chad (ISO and FIFA country code: CHA)

The Japanese word for brown or tea.

Channel Adapter in the Hewlett-Packard XP storage system

Canadian Heraldic Authority

College Hockey America, the NCAA Division I conference

Chamaeleon (constellation)

Chattanooga Metropolitan Airport (IATA airport code: CHA), an airport in Chattanooga, Tennessee

Competent Harbour Authority - responsible for provision of pilots and navigation aids in UK waters

Chunta Aragonesista (Aragonese Council)

Circumhorizontal arc, an atmospheric optical phenomenon

Chicago Housing Authority

Cha (Korean name)

Catholic Health Association of The United States

Cha Cha Cha

China Telecom (NYSE: CHA), a telecommunications provider in the People's Republic of China