Santa Maria in Vallicella, also called Chiesa Nuova, is a church in Rome, Italy, which today faces onto the main thoroughfare of the Corso Vittorio Emanuele and the corner of Via della Chiesa Nuova. It is the principal church of the Oratorians, a religious congregation of secular priests, founded by St Philip Neri in 1561 at a time in the 16th century when the Counter Reformation saw the emergence of a number of new religious organisations such as the Society of Jesus (Jesuits), the Theatines and the Barnabites.

There are more than 900 churches in Rome, which makes it the city with the largest number of churches in the world. Almost all of these are Catholic.