Jo Ann Castle (born September 3, 1939) is an American honky-tonk pianist, best remembered for appearing on The Lawrence Welk Show.

[2] She adopted her stage name from the name of an accordion manufacturer, another instrument she played proficiently.

Shortly after joining the Show, Castle married cameraman Dean Hall.

In the 1990s, Castle performed at the Welk-owned Champagne Theater in Branson, Missouri, as well as making a guest appearance for a show with Jimmy Sturr and His Orchestra on RFD TV.

On September 3, 2011, Castle married her fourth husband, Lin Biviano, who was a trumpet player from Boston.