The Renault R26 is a Formula One racing car, used by the Renault F1 team in the 2006 Formula One season. The chassis was designed by Bob Bell, James Allison, Tim Densham and Dino Toso with Pat Symonds overseeing the design and production of the car as Executive Director of Engineering and Rob White leading the engine design. The car was driven by Fernando Alonso and Giancarlo Fisichella. Over the course of the season it scored 8 wins out of 18 races, and was the most complete package in most of the year, followed closely by the rival Ferrari 248 F1. The R26 helped Renault in claiming the Constructors' Championship with a 5-point advantage over rival Ferrari, and also taking Fernando Alonso to his second Drivers' Championship in succession, 13 points ahead of rival Michael Schumacher. It brought the last Constructors' Championship in recent history to tyre manufacturer Michelin. Renault used 'Mild Seven' logos in Bahrain, Malaysia, Australia, Spain, Monaco, United States, Hungary, China and Japan.
Like its rival the Ferrari 248 F1, the R26 was notable for its rock-solid reliability, chassis R26-03 driven by Fernando Alonso started all of the races of the 2006 season without the need to be replaced (F1 drivers usually go through multiple chassis in a season), it also led more laps and won more races than any single chassis in 2006 in addition to winning the world championship. R26-03 now sits at Renault's “Histoire et Collection” heritage collection in Paris.
The R26 was succeeded by the R27 for the 2007 season.