The Euroformula Open Championship is a junior formula racing series based in Spain. It was one of six national and international Formula Three championships in Europe and Scandinavia that together used to form an important part of the established "career ladder" below Formula One. The championship's first season was held in 2001. In 2006, it was branded as the Spanish F3 Championship by Toyota, in deference to its sole engine supplier. In 2020, the championship ceased to be a F3-championship and will share its specifications with Japan's Super Formula Lights based on the previous-generation Formula Three standards, primarily with a choice of engines.

Formula racing is any of several forms of open-wheeled single-seater motorsport. The origin of the term lies in the nomenclature that was adopted by the FIA for all of its post-World War II single-seater regulations, or formulae. The best known of these formulae are Formula One, Formula E, Formula Two, Formula Three, regional Formula Three and Formula Four. Common usage of "formula racing" encompasses other single-seater series, including the IndyCar Series and the Super Formula Championship.