RMN can mean:
- Radio Mindanao Network
- Registered Mental Nurse
- Reconciling Ministries Network, a movement of United Methodist individuals, congregations, and other groups working for the full participation of all people in the United Methodist Church
- Richard M. Nixon, 37th President of the United States
- Royal Manticoran Navy, a fictional naval organisation in David Weber's Honorverse novels
- Royal Malaysian Navy, the navy of Malaysia
- IATA code for Stafford Regional Airport