Katharina Friederike Wilhelmine Benigna, Princess of Courland, Duchess of Sagan (born 8 February 1781 in Mitau, Duchy of Courland and Semigallia); died 29 November 1839 in Vienna, Austrian Empire) was a German noble from the ruling family of Courland and Semigallia (today part of Latvia) and a  Duchess of Sagan.
Katharina Friederike Wilhelmine Benigna, Princess of Courland, Duchess of Sagan (born February 8, 1781, in Mitau, Duchy of Courland and Semigallia); deceased November 29, 1839, in Vienna, Austrian Empire) was a German noblewoman from the ruling family of Courland and Semigallia (now part of Latvia) and held the title of Duchess of Sagan.