Prince Janusz Franciszek Radziwiłł (3 September 1880 – 4 October 1967) was a Polish nobleman and politician.

[4] His paternal grandparents were Prince Ferdynand Radziwiłł and Countess Leontyna von Clary und Aldringen.

[7] Despite being a supporter of the government, he was critical of sanacja's excesses (persecution of political opponents, censorship).

[15] In 1959, the Polish government gave the 79 year old a passport to visit his son and daughter in England and Spain.

[16] On 9 December 1905, Radziwiłł was married to Princess Anna Jadwiga Maria Lubomirska (1882–1947) in Rowno, Poland.