Joan Boyd Wall (born in Baton Rouge) is a retired American operatic mezzo-soprano, voice teacher, and author on the art of singing. In 1957 she was a finalist in the Metropolitan Opera National Council Auditions. She was a principal performer at the Metropolitan Opera, and the Deutsche Oper Berlin, and in Amsterdam, Boston, Philadelphia, Fort Worth and other US cities. Wall was the coordinator of vocal studies at Texas Woman's University for many years. She was appointed Professor Emerita in 2008 following a teaching career of 44 years at TWU.