| CA | Chromosomal Abberation | - | Computer Acronyms(common) |
| CA | Cellulose Acetate | - | Computer Acronyms(common) |
| CA | Collision Activation | - | Computer Acronyms(common) |
| CA | Corrective Action | - | Computer Acronyms(common) |
| CA | Certificate Authority | - | Human Genome |
| CA | Calcium | - | Medical(slang) |
| CA | Carrier Aircraft | - | Organizations |
| CA | Cone Angle | - | Organizations |
| CA | Contingency Abort | - | Organizations |
| CA | Contract Award | - | Organizations |
| CA | Corrective Action | - | Organizations |
| CA | Cost Account | - | Organizations |
| CA | Calcium | - | Astronomy |
| CA | California (postal Symbol) - Canada (FIPS 10-4 Country Code; ISO 3166 Digram) - Catalonia -Civil Affairs - Close Armour - Computer Associates - Counter-Air | - | Astronomy |
| CA | Catalan Language (ISO 639-1 Code) | - | Astronomy |
| CA | Citizen Act | - | Business and Finance |
