Sant'Alessandro, Neoclassical basilica in Fiesole, Italy.

Sant'Alessandro is a neoclassical basilica in Fiesole with a symmetrical design and columns of cipollino marble that frame the interior. The building consists of three naves, with the central nave notably wider than the side aisles.

Built in the 6th century, likely commissioned by King Theodoric the Great, the church was first named Santo Pietro in Gerusalemme. In 823 it was renamed for Saint Alessandro, Bishop of Fiesole, martyred in the River Reno near Bologna in 590; his remains were placed behind the altar. Reconstructions began in the 11th century, with further works in 1570 and 1782.

The church was renamed in 823 for Saint Alessandro, Bishop of Fiesole, martyred in the River Reno near Bologna in 590; his remains were returned and placed behind the altar. On the left side of the nave is a chapel with Renaissance frescoes and a 16th-century panel by Gerino di Pistoia, also linked to the adjoining Oratory of the Compagnia dell'Assunta.

The church no longer holds services and is used for exhibitions and events. Entry is through the neoclassical façade of 1815–1819 by Giuseppe Del Rosso; inside, the three-nave plan runs toward the apse, where Etruscan remains were found during restorations. The Renaissance fresco chapel and Gerino di Pistoia's 16th-century panel sit along the left nave.

The church was renamed in 823 for Saint Alessandro, Bishop of Fiesole, martyred in the River Reno near Bologna in AD 590; his remains were brought back and interred behind the altar. The 1956–1973 restoration also uncovered Etruscan remains beneath the apse.