Kate Hornsey (born 19 October 1981, in Hobart) is an Australian former three-time world champion, dual Olympian and Olympic silver medal-winning rower.

Hornsey was selected in the Tasmanian representative VIIIs who raced for the Queen's Cup at the Australian Rowing Championships on seven occasions from 2003 to 2008 and in 2014.

The typical squad changes that occur after an Olympic year as rowers take breaks or step away happened after Athens 2004 and Hornsey took her opportunities.

The W8+ took bronze behind the US and Germany while the W4- won both their heat and final giving Hornsey and Robyn Selby Smith their second World Champion title in this boat class in successive years.

She didn't compete in 2009 but at Lake Karapiro at the 2010 World Rowing Championships she stroked the Australian W4- to a silver medal.