John Godfrey Parry-Thomas (6 April 1884 – 3 March 1927) was a Welsh engineer and motor-racing driver who at one time held the land speed record.

In partnership with another engineer, Major Ken Thomson from New Zealand, he started Thomas Inventions Development Co., based inside the Brooklands circuit itself.

By 1925 Parry-Thomas realised that commercial success required a higher profile than Brooklands could offer, and switched his attention to the land speed record.

Without Campbell's money and prestige, or Henry Segrave's factory connections, Parry-Thomas was unable to obtain a brand-new Napier Lion, as the other record contenders were planning.

Parry-Thomas was killed at Pendine Sands on 3 March 1927 while trying to regain his own world land speed record that had been broken just weeks earlier by Malcolm Campbell on the same beach.

At the time of the accident, it was thought that the right-hand chain had broken and had hit Thomas, causing a fatal head injury as the car was rolling.