Penton Hook Marina is the largest inland marina in Britain, set within 80 acres of former gravel pits on the non-tidal River Thames in Surrey, between Staines and Chertsey.

It offers approximately 600 berths and can accommodate vessels up to 30 metres in length. The marina sits on the western bank of the Thames, close to Thorpe Park and downstream from Runnymede, the historic site where Magna Carta was signed in 1215.

Originally established around Penton Hook Lock, which opened in 1815, the site was purchased by MDL Marinas in 1973.

On-site boatyard services include lifting, towing, antifouling, and pressure washing, and two pump-out stations are available for visiting boaters.