The Edgar Percival E.P.9 was a 1950s British light utility aircraft designed by Edgar Percival and initially built by his company, Edgar Percival Aircraft Limited and later as the Lancashire Aircraft Prospector by the Lancashire Aircraft Company.

Edgar Wikner Percival was a noted Australian aircraft designer and pilot whose aircraft were distinguished by speed and grace. Percival went on to set up the Percival Aircraft Company, a British aircraft company.