The 1955 RAC Tourist Trophy took place on 17 September, on the roads around Dundrod,. It was also the fifth round of the F.I.A. World Sports Car Championship, however it was the first championship race following the horrendous tragedy at Le Mans. It was also the Golden Jubilee year for the RAC Tourist Trophy. Going into the race, Ferrari were leading the Manufacturers Championship by four points from Jaguar. Victory for the Italian marque would put them in a strong position to win a third successive title.

Dundrod Circuit is a motorsport street circuit used for the Ulster Trophy for Formula One and Formula Two cars from 1950 to 1953, the RAC Tourist Trophy for sports cars between 1950 and 1955, and for the motorcycle Ulster Grand Prix from 1953 onwards. It is situated near the village of Dundrod in Lisburn, Northern Ireland. The nearby Clady Circuit also in County Antrim was used for the Ulster Grand Prix between (1922–1952) before moving to the Dundrod Circuit.