Rainiero d'Elci (7 March 1670–22 June 1761) was an Italian Cardinal.

[1] Pope Clement XII created him Cardinal on 20 December 1737[1] but did not publish it before the following June.

In the same year he became archbishop of Ferrara, an office he held until 1740;[1] he was then legate in that city.

[1] He became Dean of the Sacred College of Cardinals at the death of Pietro Luigi Carafa on 15 December 1755, and as such he was transferred to the see of Ostia e Velletri (proper of the Dean) on 12 January 1756.

He died in Rome and is buried in his titular church of Santa Sabina.