Keith Weller Horne (born 9 June 1971) is a professional golfer from South Africa.

In 1993, Horne won a Silver Medal at the World Games in Spain.

His first professional win came in 1998 at the Vodacom Series: Kwazulu Natal.

In 2010, a runner-up finish in the Joburg Open, and a top-10 finish at the Singapore Open, both events which are co-sanctioned with the European Tour meant that Horne earned enough to have a full European Tour membership for 2011.

In 2012, he picked up his fifth victory on the Sunshine Tour at the Telkom PGA Championship.