English abbreviations from ch to chap
- ch (Chamorro language (ISO 639-1 code))
- ch. (church)
- CH4 (Methane)
- CH-53 (Helicopter version 53, Cargo variant (Sea Stallion))
- CHA (Catholic Health Association)
- CHAA (Canadian Harvard Aircraft Association)
- CHAAD (Children and Adults with Attention-Deficit/Hyperactivity Disorder)
- CHAALS (Common High Accuracy Airborne Location System)
- CHAC (Cradle of Hope Adoption Center)
- CHACI (Cradle of Hope Adoption Center, Inc.)
- CHADD (Children and Adults with Attention- Deficit/ Hyperactivity Disorder)
- CHAE (Centre for Higher and Adult Education (University of Stellenbosch))
- CHAIN (Communities Helping Adults In Need)
- CHALLS (Communications High Accuracy Airborne Location System)
- CHALS-X (Communications High Accuracy Location System Exploitable)
- CHAM (Christian Health Association of Malawi)
- CHAMP (CHAMPion)
- CHAMPION (Care And Helping Assist Men Prosper In Our Neighborhood)
- CHAMPS (Children Against Mines Programs)
- CHAMPUS (Civilian Health and Medical Program of the Uniformed Services)
- CHAMPVA (Civilian Health and Medical Program of the Veterans Administration)
- CHAN (Channel)
- CHANCE (Community Help And Neighbourly Care For Everyone)
- CHANGE (Communities Helping All Neighbors Gain Empowerment)
- CHAOS (Cambridge Heart Anti-Oxidant Study)
- CHAP (Challenge-Handshake Authentication Protocol)