Keith Weller Horne (born 9 June 1971) is a professional golfer from South Africa.
Horne was born in Durban and had a successful amateur career. In 1993, Horne won a Silver Medal at the World Games in Spain. He turned professional in 1996.
After turning professional in 1996, Horne immediately joined the local Sunshine Tour, the richest professional golf tour in South Africa. His first professional win came in 1998 at the Vodacom Series: Kwazulu Natal. After that, he had a few off-seasons until he won a few unofficial Pro-Ams in 2003. His second official win came in 2007 at the MTC Namibia PGA Championship. He won again a year later at the Nashua Golf Challenge. Horne also holds membership on the Asian Tour, where he has yet to win.