Rainiero d'Elci (March 7, 1671, Florence – June 22, 1761, Rome) was an Italian Cardinal. He was ordained in 1699. He entered papal service in the following year and held several offices both in Roman Curia and in the papal territorial administration. He was Inquisitor of Malta from 1711 until 1716. He presided over the Papal conclave, 1758. In spite of his advanced age, he received several votes during its celebration. He is buried in his titular church of S. Sabina in Rome.