Mikołaj Radziwiłł, Mikalojus Radvila, or Nicholas Radziwill may refer to:
Mikalojus Radvila the Old (c. 1450–1509), Grand Chancellor of Lithuania Mikołaj II Radziwiłł (1470–1521), Grand Chancellor of Lithuania Mikołaj III Radziwiłł (1492–1530), Bishop of Samogitia Mikołaj Radziwiłł the Red (1512–1584), Voivode of Vilnius, Grand Chancellor and Grand Hetman of Lithuania Mikołaj VII Radziwiłł (1546–1589), Voivode of Navahrudak
See also Radziwill family