San Barnaba is a church in Milan, Italy. It is the first edifice of the Barnabites order.
Designed by Galeazzo Alessi, it is a small church with a nave with barrel vault, finishing in a square-plan presbytery.
The interior includes a notable selection of Milanese Mannerist artworks: the Stigmata of St. Francis by Giovan Paolo Lomazzo, a Pietà by Aurelio Luini and, flaking the high altar, two large canvasses with Histories of St. Paul and Barnaba, Simone Peterzano's first work in the city (1572–1573).
Coordinates: 45°27′35″N 9°11′56″E / 45.459656°N 9.198927°E / 45.459656; 9.198927