Anna Caterina Antonacci (born 5 April 1961) is an Italian soprano, known for her roles in the bel canto and Baroque repertoire.
Born in Ferrara, Antonacci studied in Bologna, and made her debut as Rosina in 1986 at Arezzo. She spans the soprano and mezzo-soprano repertoire. Antonacci possesses a dark, flexible voice that has been put to great use in the Rossini canon.