The Theodore TY01 was a racecar designed by Tony Southgate and raced in the 1981 Formula One season.

Drivers of the car included Derek Daly, Geoff Lees, Marc Surer and Patrick Tambay.

The car had a Ford Cosworth DFV V8 engine and Michelin or Avon tyres. The car had an aluminium monocoque chassis and a Hewland FGA 400 gearbox with five gears.

The car endured only moderate success throughout its career.