Prince Antoni Henryk Radziwill (Polish pronunciation: [rad?i'viw]; 13 June 1775 – 7 April 1833) was a Polish and Prussian noble, aristocrat, musician and politician.
Initially a hereditary Duke of Nieswiez and Olyka, as a scion of the Radziwill family he also held the honorific title of a Reichsfürst of the Holy Roman Empire.
Between 1815 and 1831 he acted as Duke-Governor (Polish: ksiaze-namiestnik, German: Statthalter) of the Grand Duchy of Posen, an autonomous province of the Kingdom of Prussia created out of Greater Polish lands annexed in the Partitions of Poland.