Église Sant'Arcangelo a Baiano, Baroque church in historic center, Naples, Italy.

Sant'Arcangelo a Baiano is a church on Via Sant'Arcangelo a Baiano in Naples' historic centre, dedicated to Saint Michael the Archangel. Its bare facade holds a plain portal, and the interior has a central plan with side chapels. The church has been closed for decades; the adjoining former monastery is now a disused civil building with apartments and a mirror workshop, and traces of 15th-century Catalan architecture, including part of a portico, survive.

The church and its adjoining monastery were founded at the end of the 6th century by a community of Basilian monks, later passed to Benedictine nuns. In the 13th century Charles I of Anjou had it rebuilt, the first Angevin work in the city, and gave the nuns relics of Saint John the Baptist. The monastery was suppressed in 1577; the church was remodelled in the 17th century with the small square in front.

The church is dedicated to Saint Michael the Archangel. Its name recalls the Baiano district, and the monastic complex was suppressed in 1577 after accusations of immoral and criminal conduct against the nuns. Stendhal drew on these events for his book "Chronicle of the Convent of Sant'Arcangelo a Baiano", a bestseller in the 19th century.

The church interior has been closed for decades and the whole structure needs conservation work, so it cannot be visited. The former monastery is now a disused civil building with apartments and a mirror workshop; parts of a 15th-century Catalan portico are occupied by the workshop. The church stands on Via Sant'Arcangelo a Baiano, facing a small square laid out in the 17th century.

The attached monastery was shut down in 1577 after its inhabitants violated monastic rules. This episode caught the attention of later writers including Benedetto Croce and Stendhal, who documented the story.