Maria Kallaste (born November 11, 1983) is an Estonian opera singer (mezzo-soprano). She has studied in the singing department of the Tartu Music School named after Heino Eller (graduated in 2006) and in the singing class of Jaakko Ryhänen at the Estonian Academy of Music and Theater. Since 2012, she has been working at the Vanemuine Theater. Maria Kallaste's life partner is actor Ott Sepp. They have a son together.