Frances Carter Barron Casteel, known as Carter Casteel (born December 10, 1942), is an attorney and Republican politician from New Braunfels, Texas. A former county judge of Comal County, Casteel served as well from 2003 to 2007 in the District 73 seat in the Texas House of Representatives currently held by another Republican, Doug Miller, a former mayor of New Braunfels.