| RKA | IEEE Richard H. Kaufmann Award
| Others |
| RKA | Rachael Kay Albers
| Others |
| RKA | Rahul Kavel and Aashik
| Others |
| RKA | Ralph Kimball Associates
| Others |
| RKA | Ranged Killing Attack
| Others |
| RKA | Raven Kindred Association
| Others |
| RKA | Rayhaan Khan Ahmed
| Others |
| RKA | Regional Kindergarten Association
| Others |
| RKA | Related Key Attack
| Others |
| RKA | Relativistic Klystron Amplifier
| Others |
| RKA | Retained Knee Activity
| Others |
| RKA | Right Knee Arthroscopy
| Others |
| RKA | Riverdale / Kingsbridge Academy
| Others |
| RKA | Riverdale Kingsbridge Academy
| Others |
| RKA | Rocket Knight Adventures
| Others |
| RKA | Roesskije Kosmitsjekoje Agentsvo
| Others |
| RKA | Roger Kaufman and Associates
| Others |
| RKA | Roslyn, Kunin, and Associates, Inc.
| Others |
| RKA | Rossiskaja Kosmitska Agentura
| Others |
| RKA | Rossiyskoe Kosmicheskoye Agentsvo
| Others |
| RKA | Rubenzahl Knudsen and Associates
| Others |