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Christopher Horner (born October 23, 1971) is an American professional road bicycle racer for UCI ProTour team RadioShack-Nissan. A native and current resident of Bend, Oregon, Horner dominated the American road racing scene by winning the points standings in the 2002, 2003 and 2004 USA Cycling National Racing Calendar.
On October 4, 2009 it was confirmed that Horner would compete for Team RadioShack in the next two seasons. In one of his strongest European campaigns, Horner garnered first overall at the Vuelta al Pais Vasco (Tour of the Basque Country), including a stage win in the critical 6th stage ITT, defeating overall threat Alejandro Valverde. Horner also achieved several top 10 placings in the Spring classics of the Fleche Wallone, Liege-Bastogne-Liege and Amstel Gold. He and his RadioShack teammates did well at the 2010 Tour of California, with Horner putting on a particularly strong performance in the last stage of the race as a member of a final breakaway at Thousand Oaks. Horner finished fourth overall, 1 min 4 sec behind winner Michael Rogers, and just 39 seconds behind teammate Levi Leipheimer in overall time. His good form also resulted in a 9th place overall at the Tour de France, as the first-placed US rider, in spite of dedicating himself in the first stages to supporting his captain Lance Armstrong.
In 2011 Horner continued his success at Pais Vasco with a second-place finish, as well as 4th in Catalunya.
Horner then accomplished the highest-profile result of his career by winning the May 2011 Tour de California stage race. He scored a major solo victory on the 4th stage, after making significant time gains on the day’s final mountain finish in San Jose. He maintained his hold on the yellow jersey until the tour’s queen stage, where he completed a two-man breakaway finish with teammate Levi Leipheimer to finalize the overall lead, and at age 39 became the oldest rider in history to win that tour.
His participation at the 2011 Tour de France was short lived after a crash left him out of the competition.
In 2012, Horner signed with RadioShack-NissanTrek. He started The Tirreno-Adriatico as his first race since July where he finished second. He then finished 8th in the Tour of California, failing to defend his title. He then rode the Tour de France where he ended up finishing 13th overall after putting a good performance in the mountains.