San Gregorio dei Muratori, Catholic church in Campo Marzio district, Rome, Italy

San Gregorio dei Muratori is a church on Via Leccosa in Rome's Campo Marzio district, set at the end of a narrow alley and incorporated since 1933 into the Palazzo Marescalchi designed by Felice Nori. Its nave is wider than it is long, and the facade runs parallel to the nave, so the two entrance doors open on the right side. The interior has a fresco cycle of the life of Saint Gregory, a ceiling fresco of the Holy Trinity, two side altars, and the original cotto floor.

According to the archaeologist Rodolfo Lanciani, Pope Clement VII restored an already existing church and dedicated it to Saint Gregory the Great rather than founding it ex novo. The Confraternita dei Muratori built the present oratory in 1527; the guild decided to add an oratory in 1588, restored the church in 1599 and rebuilt it substantially in 1748. The guild was legally suppressed in 1801, the church closed in 1912, and in 1933 it was demolished and incorporated into the new Palazzo Marescalchi by Felice Nori.

The church is dedicated to Saint Gregory the Great, who holds special meaning for builders and craftsmen as their protector. The space reflects how guilds created their own places of worship and maintained these connections across centuries.

The church stands at the end of Via Leccosa, a narrow alley in Campo Marzio, now enclosed within the Palazzo Marescalchi built in 1933. Look for the entrance on the right side of the nave, not at the rear, since the facade runs parallel to the aisle. The building belongs to the parish of Sant'Agostino in Campo Marzio.

The facade runs parallel to the nave, so the two entrance doors open onto the right side of the church rather than the back. Between two Doric pilasters on the facade is a 1664 fresco of Saint Gregory the Great giving a blessing, painted by Giovanni Battista Palozzi.