The Honda S660 is a two-seat sports car which fits in the very small kei car category. It is manufactured by the Japanese manufacturer Honda. The car weighs approximately 830 kg with the manual transmission and 850 kg with the CVT automatic. A prototype was shown at the November 2013 Tokyo Motor Show, the major Japanese auto show event. It is the successor to the Honda Beat. The naming convention of using the letter "S" followed by the engine displacement is a long-held Honda tradition going back to Honda's first production car, the Honda S500.
The S660 is a very lightweight, mid-engined, roadstersports car. It shares a platform with the Honda N-One. Its dimensions, because of kei car Japanese legislation, is almost identical to the 1990s Honda Beat, and uses the same three cylinder engine with mechanical improvements.
The Japanese Kei car model is powered by a 660 cc motor with approximately 47 kW (63 hp) and 104 N⋅m (77 lb⋅ft) torque to meet Kei regulations. Its introduction signals a return to two-door sports coupes from Honda, taking the smallest position below the larger Honda CR-Z and the top level luxury Honda NSX. It is a modern version of Honda's first mass-produced car, the Honda S500 introduced in 1963.