Lucy Ann Kidd–Key (née Lucy Ann Thornton; at first marriage, Lucy Ann Kidd; November 15, 1839 – September 13, 1916) was an American educator and music college administrator from the U.S. state of Kentucky. She founded and served as first president of the North Texas Female College (renamed Kidd-Key College), of Sherman, Texas, the first woman south of the Mason–Dixon line to hold such a position.