Top Secret Co., Ltd. (株式会社トップシークレット, Kabushiki-gaisha Toppu Shīkuretto) is a Japanese automobile tuner and parts manufacturer. The company was founded by Japanese automotive engineer and driver, Kazuhiko “Smoky” Nagata.
The company is mainly known for its body kits and performance engineering. Top Secret is also known for its illegal Wangan high speed runs, professional drifting, circuit, and drag racing. A recognizable feature of many Top Secret tuned cars are their gold paint schemes. Only cars that Nagata deem to be his best work receive this paint scheme.