Kathy Baker Cornelius (born October 27, 1932) is an American professional golfer.

Born in Boston, Massachusetts, Cornelius attended Florida Southern College, where she played on the men's golf team, as the school did not have a women's team at the time. She turned pro in 1953 and married golf pro Bill Cornelius the same year. She joined the LPGA Tour in 1956 and won two events in her rookie season, including the U.S. Women's Open, which was to be her only major championship. She won six LPGA Tour titles in total and had her highest money list finish in 1973, when she came eighth. She made the top-20 of the money list twelve times in total (1957-65 and 1971-73).

In 1985, Kathy and her husband founded Magique Golf, a golf club company based in Arizona, which they ran until 1999. She now teaches golf part-time at Rio Salado Golf Course in Tempe, Arizona. Her daughter, Kay, won the 1981 U.S. Girls' Junior, making them the only mother-daughter pair to win USGA championships.