RJN
| Acronym | Definition |
|---|---|
| RJN | Rada Jednosci Narodowej (Polish: Council of National Unity; quasi parliament of Poland during WWII) |
| RJN | Russian Journal of Nematology |
| RJN | Ram Janambhoomi Nyas (Hindi: Ram Birthplace Trust) |
| RJN | Red de Jóvenes Nicaragüita (Spanish: Youth Network Nicaragüita) |
| RJN | Rockland Journal-News (now The Journal News; New York) |