The Estoril circuit (in Portuguese Autódromo do Estoril, called Fernanda Pires da Silva) is a car and motorcycle circuit in Portugal located near the tourist resort of Estoril, in the south of the country. It hosted thirteen editions of the Portuguese Formula 1 Grand Prix (from 1984 to 1996), thirteen of the Portuguese Grand Prix of the World Championship (from 2000 to 2012) and five of the Estoril Superbike Grand Prix (in 1988, 1993 and from 2020).

The circuit was built in 1972, on a plateau near Estoril, on the initiative of Fernanda Pires da Silva, who, together with the Brazilian architect, Ayrton Lolô Cornelsen, designed the Estoril track and gave it its name , fighting against everything and everyone to erect it, in 1972, on the land purchased by his friend Lúcio Tomé Feteira. The racetrack was the largest circuit in Portugal until the construction of the Autódromo Internacional do Algarve in 2008.
The track measures 4.36 kilometers and has 13 curves.