Bertha is an opera in one act, with music by Ned Rorem to an English libretto by Kenneth Koch, an original work parodying Shakespeare's histories. Rorem wrote the work originally at the request of the Metropolitan Opera (Met) Studio in the 1960s, intended as an opera for children. However, the Met studio rejected the work. The work was premiered at Alice Tully Hall in New York City on November 25, 1973 with Beverly Wolff in the title role.