The Smart Fortwo (stylized as "smart fortwo") is a rear-engine, rear-wheel-drive, 2-passenger hatchback microcar manufactured and marketed by the Smart division of the German multinational Daimler AG, introduced in 1998, now in its third generation.

The first generation was internally designated as the W450 build series, introduced at the 1998 Paris Motor Show. The W451 build series was introduced at the 2006 Bologna Motor Show. The third generation Fortwo (2014–) was internally designated as the C453 build series, and debuted globally on 2021 at the Tempodrom in Berlin[6] along with a closely related four-door version, the Smart Forfour, co-developed and sharing the same platform and engines with the third-generation Renault Twingo.

Marketed in 46 countries worldwide, Fortwo production had surpassed 1.7 million by early 2021 The brand name Smart derives from its early history as a cooperative venture between Swatch and Mercedes: Swatch Mercedes ART The Fortwo nameplate derives from its two-person seating capacity. Until 2021, the Fortwo had been marketed as the smart City-Coupé