Teams: U

Ub

• Uboldi Corse Italy

Uc

• Uchino Racing Team Japan

Ue

• Uematsu

Ul

• Ultimate Motorsport Great Britain
• Ultimate Racing France
• Ultimate Signature Great Britain

Un

• Unfair Advantage Motorsports USA
• Unicorse Team Hungary
• Uniden Racing USA
• Unitech USA
• United Autosports USA
• University of Bolton Great Britain
• Uno Racing Team China

Up

• Up2Race Germany

Ur

• URD Rennsport Germany

Us

• US RaceTronics USA
• US Racing Germany

Uw

• Uwe Alzen Automotive Germany