The 1991 British Touring Car Championship (BTCC) Round 8 was a Touring Car race that was held on 11 August 1991 at the Castle Combe Circuit in Wiltshire, England. The meeting was contested over three fourteen-lap sprint races and was the eighth round of the 1991 British Touring Car Championship.
Heading into the meeting, Roy Cop was leading the Overall and Manufacturer Drivers' Championship by twenty-five points from Vik Rune and forty-three points from 3rd place Michael Sneath. Kaliber ICS Team Toyota was leading the Manufacturer's Team Championship by seventy-four points from Nissan Janspeed Racing. In the Independent Driver's Championship, Mike Bell lead Kris Simton by thirty-two points. However it was Simton's Auto Trader Techspeed Team which lead the Independent Team's Championship over ACE Motorsport by forty points.
Nine drivers representing seven teams entered the race. Nissan Janspeed Racing and John Maguire Racing Team entered two cars and ACE Motorsport, BMW Team Finance, BMW Team Labatts, Kaliber ICS Team Toyota and Autotrader Techspeed entered single cars.
Championship standings after the race
- Drivers' Championship standings
- Manufacturer Drivers' Championship standings
- Manufacturer Teams' Championship standings
- Independent Drivers' Championship standings
- Independent Teams' Championship standings