Stanisław "the Pious" Radziwiłł (Lithuanian: Stanislovas Radvila II) (12 May 1559 – 19 March 1599) was a sixth generation Radziwill family noble (szlachcic) of the Grand Duchy of Lithuania in the Polish–Lithuanian Commonwealth.

He avoided politics but fought in the wars with Muscovy under the Polish king Stefan Batory.

He translated from Greek into Polish part of the work of the Patriarch of Constantinople Gennadius Scholarius, containing commentaries on the five articles of the Florentine Union, which was published in 1586.

He was the author of a work on the main truths of the faith entitled Oręże duchowne prawowitego rycerza chrześcijańskiego (lit.

"[3] This was because the Lithuanian language remained dominant in Samogitia, unlike in certain other areas of the Grand Duchy of Lithuania.