Infobox last updated on: September 21, 2008.

Luis Horna Viscari (born September 14, 1980 in Lima) is a tennis player from Peru, who turned professional in 1998. Horna plays right-handed, he has a strong serve for a relatively short player and the forehand is his best stroke. He uses a single-handed backhand and his favourite surface is clay. He is the current Men's Doubles Champion of the 2008 French Open with his Uruguayan teammate Pablo Cuevas.

Horna is known by his nickname "Lucho", which comes from his first name. Horna was an outstanding junior player in both singles and doubles. He made the final of the boys singles at the French Open in 1997 losing to Daniel Elsner. Horna won the French Open and Wimbledon doubles with Jose de Armas and Nicolás Massú respectively.