The Church of Saint Susanna at the Baths of Diocletian (Italian: Chiesa di Santa Susanna alle Terme di Diocleziano) is a Roman Catholic parish church located on the Quirinal Hill in Rome, Italy. There has been a titular church associated to its site as far back as A.D. 280. The current church was rebuilt from 1585 to 1603 for a monastery of Cistercian nuns founded on the site in 1587 which still exists there.
he church consists of a single nave, with a circular apse forming two side-chapels. The frescoes of the central nave by Baldassare Croce represent six scenes from the life of Susanna found in the Book of Daniel. The frescoes on the curved side of the apse shows Saint Susanna being threatened by Maximian, but defended by the angel of God and to the right, Susanna refusing to worship the idol Jupiter. Nebbia's frescoes of the dome of the apse depict Saint Susanna flanked on either side by angels with musical instruments. Behind the high altar, the painting depicting the beheading of Saint Susanna is by Tommaso Laureti.