Domenico Allegri (c.1585 – September 5, 1629) was an Italian composer and singer of the early Baroque Roman School. He was born and died in Rome. It is not known whether he was related to the more famous Gregorio Allegri.

Allegri was maestro di cappella of the church of Santa Maria at Spello around 1608 to 1609, and subsequently served in the same rôle at the church of Santa Maria in Trastevere in Rome, and then at Santa Maria Maggiore for the rest of his life.

Domenico Allegri is mainly famous as being one of the first to include specific instrumental accompaniments to sacred vocal music on a small scale. While much of his music is lost, one piece which has survived is the Modi quos expositis in choris of 1617 which has accompaniments to the voices by two violins.