| Acronym | Definition |
|---|
| ARMA | Association of Records Managers & Administrators (formerly American Records Management Association) |
| ARMA | Armed Assault (military simulation game) |
| ARMA | Association for Renaissance Martial Arts (formerly Historical Armed Combat Association) |
| ARMA | Autoregressive Moving Average |
| ARMA | American Rock Mechanics Association |
| ARMA | Asphalt Roofing Manufacturers Association (Rockville, Maryland) |
| ARMA | Association of Residential Managing Agents (trade association; UK) |
| ARMA | Auto Regressive Moving Average |
| ARMA | Association of Research Managers and Administrators (UK) |
| ARMA | American Records Management Association (now Association of Records Managers & Administrators) |
| ARMA | Atlas du Risque de la Malaria en Afrique |
| ARMA | Audiovisual Rights Management Association (Japan) |
| ARMA | Adaptability Rating for Military Aviation |
| ARMA | Annular Ring Microstrip Antenna |
| ARMA | Association Réunionnaise des Maquettistes Amateurs (French amateur modellers association) |