RLM may refer to:
- RLM, a wholly owned subsidiary of the Lockheed Martin Corporation, with significant presence in the Australian defence industry
- Real Life Ministries, a non-denominational Evangelical Christian church in Idaho
- Reichsluftfahrtministerium, the Ministry of Aviation (Germany)
- Right-to-left mark, writing direction control character
- Red Letter Media, an American film production house that has achieved moderate fame for their 'Plinkett Reviews'