SARD Corporation (株式会社サード, Kabushiki gaisha Sādo; abbreviated as Sigma Advanced Racing Development) is a Japanese tuning company and racing team from Toyota, Aichi, mainly competing in the Super GT series and specializing in Toyota tuning parts.

The company was formed in 1972 as Sigma Automotive Co., Ltd by Shin Kato to develop and produce motorsport related parts and accessories as well as operating their own racing team.

In 1985, the racing division of Sigma Automotive became an independent company, Kato established a company called Sigma Advanced Racing Development (SARD) specializing in motorsport as well as producing aftermarket parts for Toyota automobiles.

Sigma Advanced Racing Development (SARD) develops and manufactures tuning parts mainly for Toyota cars, namely turbochargers, redesigned fuel systems and cooling systems, suspension parts and aerodynamic kits. The company is not restricted to Toyotas as they are well known within the aftermarket tuning market for their fueling components used by numerous tuning companies.

Also, under the SARD Marine Project, a separate project to its car works, it builds and sell its Toyota powered motorboats.

Sigma Automotive began its racing career in the Fuji Grand Champion Series and in 1973 participated for the first time in the 24 Hours of Le Mans with their Sigma MC73, powered by a Mazda Wankel engine, becoming the first Japanese car to qualify for Le Mans, before retiring early in the race with electrical problems. The team returned for the following year with a Mazda backed MC74, finishing but not making enough laps to be classified. In 1975 the team switched to a Toyota powerplant in the MC75, only to suffer from another early retirement. After transitioning out of international motorsports, Sigma Automotive would continue to compete in numerous domestic series.

SARD returned to international motorsports in 1989, debuting as a Toyota backed team named Toyota Team SARD in the first round of World Sports Prototype Championship held in Suzuka, using a Toyota 89C-V, also competing in the All Japan Sports Prototype Championship. With the demise of Group C in 1993, SARD switched to the newly formed JGTC series and also return to Le Mans with a V8 powered MR2 known as the MC8-R, having the same spell of misfortune as they had during the 1970s, competing in 1995 and 1996, only to fail to pre-qualify in the face of the newer generations of GT1 cars in the following year. SARD also entered a Toyota Supra in first two years of the MC8-R program where it faced against fellow Japanese GT machines in form of Nissan Skyline GT-R and Honda NSX, the latter which also raced in and won the GT2 class in 1995. The JGTC-specification Supra was entered in the 1995 24 Hours of Le Mans where it finished 14th, the team returned again in 1996 but did not finish.

SARD continued to compete in the JGTC and Super GT series with works-backed Toyotas and Lexuses; the team currently fields a Toyota GR Supra under the Toyota Team SARD name. In the 2016 Super GT Championship, SARD won its first-ever Super GT championship with a Lexus RC F driven by Heikki Kovalainen and Kohei Hirate.