The Mellini or Saint Nicholas of Tolentino Chapel (Italian: Cappella Mellini, Cappella di San Niccolò da Tolentino) is the third chapel on the left-hand side of the nave in the Church of Santa Maria del Popolo in Rome. The chapel contains several funeral monuments of the members of the Mellini family among them the works of Alessandro Algardi and Pierre-Étienne Monnot.