William Lomas was an English Grand Prix motorcycle road racer. He was a two-time World Champion and a two-time Isle of Man TT winner. He won the 1955 and 1956 350cc world championship as a member of the Moto Guzzi factory racing team. In the 1956 season, he rode the famous V8 Moto Guzzi Grand Prix race bike. Lomas was also an accomplished trials rider.