| Acronym | Definition |
|---|
| PKA | Previously Known As |
| PKA | Protein Kinase A |
| PKA | Ionization Constant (chemistry, kinetics) |
| PKA | Painkiller Already |
| PKA | Professional Karate Association |
| PKA | Pi Kappa Alpha (fraternity) |
| PKA | Public Key Authentication (computing) |
| PKA | Private Key Access |
| PKA | Primary Key Attribute |
| PKA | Public Key Authentication |
| PKA | Pohjois-Karjala (Finland) |
| PKA | Public Key Algorithm |
| PKA | Professionally Known As |
| PKA | Primary Knock-on Atom |
| PKA | Philip Koether Architects (est. 1994) |
| PKA | Public Key Authority |
| PKA | Negative Log of Ka |
| PKA | Professional Karate Academy (Red Bank, New Jersey, USA) |
| PKA | Penalty Kick Goals Allowed (soccer) |
| PKA | Philippine Kendo Association (Philippines) |
| PKA | Paul Kagan Associates, LTD |
| PKA | Pääkirjaston Aikuisten Osasto (Finnish) |