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The Segway PT is a two-wheeled, self-balancing electric vehicle invented by Dean Kamen. It is produced by Segway Inc. of New Hampshire, USA. The name "Segway" is a homophone of "segue" (a smooth transition, literally Italian for "follows") while "PT" denotes personal transporter.

The company was sold in early 2010 to a group led by British millionaire Jimi Heselden, chairman of Hesco Bastion,^[1] who died in an accident involving a Segway on 27 September 2010.

Computers and motors in the base of the device keep the Segway PT upright when powered on with balancing enabled. Users lean forward to go forward, lean back to go backward, and turn by using a "Lean Steer" handlebar, leaning it left or right. Segway PTs are driven by electric motors at up to 12.5 miles per hour (20.1 km/h). Gyroscopic sensors are used to detect tilting of the device which indicates a departure from perfect balance. Motors driving the wheels are commanded as needed to bring the PT back into balance.

The Segway was unveiled 3 December 2001, following months of public speculation, and first produced in 2002.

Segways have had success in niche markets such as transportation for police departments, military bases, warehouses, corporate campuses or industrial sites. The legal road worthiness of the Segway varies with different jurisdictions' classification of the device as a motor vehicle