| Mikołaj III Radziwiłł | |
| Birth Date: | 1492 |
| Death Date: | 3 November 1529/30 |
| Death Place: | Varniai, Lithuania |
| Parents: | Mikolaj Radziwiłł Elźbieta Sakowicz |
Mikolaj Radziwiłł (Lithuanian: Mikalojus Radvila III) (c. 1492–1530) was the Bishop of Samogitia of Radziwill Family. He was son of Mikolaj Radziwiłł, Grand Chancellor of Lithuania.