Karita Marjatta Mattila (born 5 September 1960) is a Finnish operatic soprano.
Mattila appears regularly in the major opera houses worldwide, including the Metropolitan Opera, the Royal Opera House in London, Théâtre du Châtelet, Opéra Bastille, the Lyric Opera of Chicago, San Francisco Opera, Houston Grand Opera, Vienna State Opera, Toronto Roy Thomson Hall, and Großes Festspielhaus in Salzburg.