RMA may refer to;
- Randolph-Macon Academy
- Rate-Monotonic Analysis, the qualitative method used to prepare a system for Rate-monotonic scheduling
- Refusal of medical assistance, where a patient or their medical power of attorney refuses treatment and/or transport to a hospital by Emergency Medical Services
- Regional Mobility Authority
- Registered Medical Assistant
- Relationship Management Application, a service offered by SWIFT
- Reliability, Maintainability, and Availability
- Resource Management Act, an Act of Parliament in New Zealand
- Respect for Marriage Act
- Return merchandise authorization, returning goods to the supplier for repair or replacement
- Revolution in Military Affairs, the recent rapid development of military technology and its corresponding impact on warfare
- Richmond Metropolitan Authority
- Risk Management Analysis
- Riverside Museum Associates, a non-profit that supports the Riverside Metropolitan Museum
- Rocky Mountain Arsenal, near Denver, Colorado
- Royal Marine Artillery, formerly a part of the Royal Marines
- Royal Military Academy
- Rubin Museum of Art
- Russian martial arts
- MTV Russian Music Awards