The 2020 Millers Oils Ginetta GT4 Supercup is a multi-event, one make GT motor racing championship held across England and Scotland. The championship features a mix of professional motor racing teams and privately funded drivers, competing in Ginetta G55s that conform to the technical regulations for the championship. It forms part of the extensive program of support categories built up around the BTCC centrepiece. It is the tenth Ginetta GT4 Supercup, having rebranded from the Ginetta G50 Cup, which ran between 2008 and 2010. The season commenced on 2 August at Donington Park and concludes on 15 November at Brands Hatch, utilising the Indy circuit, after nineteen races held at seven meetings, all in support of the 2020 British Touring Car Championship.[1]