The Three X Sisters were an American all-girl harmony singing trio, initially known as The Hamilton Sisters and Fordyce. They were on stage singing together as early as 1922, and formed their trio in 1924, which was composed of Pearl Santos, Violet Hamilton who were both from Cumberland, Maryland, and Jessie Fordyce. They were known on NBC radio as radio's foremost harmony trio.
Comparable female trios of the day were the Boswell Sisters, the Pickens Sisters, and The Andrews Sisters.