MNA is a three letter acronym that can mean:
- Member of the National Assembly of Quebec
- Member of National Assembly of Pakistan
- Merpati Nusantara Airlines, an Indonesian airlines
- Missouri and Northern Arkansas Railroad
- Algerian National Movement (Mouvement National Algérien), a 1950s Algerian nationalist movement
- Modified nodal analysis, a general method of circuit analysis derived from nodal analysis
- Mehr News Agency, a news agency in Iran
- Ma'an News Agency, a news agency in the Palestinian Territories
- Master of Nonprofit Administration, a different name for Master of Nonprofit Organizations
- Museo Nacional de Antropología, the national museum of anthropology in Mexico
- Muslim National Associations, a Muslim pro-Zionist organization
- Myanmar News Agency, the official news agency in Burma
- Midland News Association, a local media company in the West Midlands, United Kingdom
- Minnesota Nurses Association, a labor union of Registered Nurses in Minnesota
- Mouvement national de l'Azawad, former name of the National Movement for the Liberation of Azawad