Konstanty Mikolaj Melchior Maria Radziwill (born 9 January 1958) is a Polish politician, physician, and the voivode of the Masovian Voivodeship.
He was Poland's Minister of Health from 16 November 2015 to 9 January 2018.
He is a former member of the Polish Senate and a past president of the Chamber of Physicians and Dentists.
He graduated from the Medical University of Warsaw.
He is a member of the aristocratic Radziwill family.He has been married since 1979 to architect Joanna Dabrowska (born in Warsaw in 1959), and the couple have four daughters and four sons.