Kate Harris-Smyth (born 22 September 1972 in Cowra, New South Wales) is an Australian marathon runner.

[1] She set her personal best time of 2:28:51, by finishing second at the 2008 Nagano Olympic Commemorative Marathon in Japan.

[2][3] 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.

[4] She also ran in the marathon at the 2006 Commonwealth Games, coming in seventh place after collapsing with heat stroke.

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