Kate Harris-Smyth (born September 22, 1972 in Cowra, New South Wales) is an Australian marathon runner. She set her personal best time of 2:28:51, by finishing second at the 2008 Nagano Olympic Commemorative Marathon in Japan.At age thirty-five, Smyth made her official debut for the 2008 Summer Olympics in Beijing, where she competed in the women's marathon, along with her teammates Benita Johnson and Lisa Weightman.