Mary Ann "Mianne" Palfrey (March 6, 1911 – November 2, 1993) was an American tennis player who was active in the late 1920s and early 1930s.

She was part of a quintet of tennis playing sisters, together with Sarah, Lee, Polly and Joanne.

[3] Palfrey won the girls' national indoor singles title in 1929, defeating her sister Sarah in the final.

[4][5] In February 1930, she won the singles title at the U.S. Indoor Championships, held at the Longwood Covered Courts in Chestnut Hill, defeating the 1924 and 1925 champion Marion Zinderstein Jessup in the final in straight sets.

On return from their honeymoon in Scotland at the outset of World War II their ship, the passenger liner SS Athenia, was torpedoed by the German U-boat U-30 and sank but the couple survived.