Fulvio Astalli (Sambuci, Lazio, 29 July 1655 – Rome, 14 January 1721) was an Italian Catholic Cardinal and Bishop.
Coming from a noble family of Lazio, he was the nephew of Cardinals Francesco Maidalchini and Camillo Astalli-Pamphili.
In May 1688 he opted for the deaconry of Santa Maria in Cosmedin and a little over a year later for that of Santi Cosma e Damiano.
In 1693 he became prefect of the Supreme Tribunal of the Apostolic Signatura and in the same year he became Papal legate in Urbino, a position he held until 1696.
On 26 April 1719 he became Dean of the Sacred College and received also the Sees of Ostia and Velletri.