Attilio Ariosti (November 5, 1666 – 1729) was an Italian composer in the Baroque style, born in Bologna. He produced more than 30 operas and oratorios, numerous cantatas and instrumental works. He was born into the middle class. He became a monk in 1688 at age 22, but he soon obtained permission to leave the order and become a composer in the court of the Duke of Mantua and Monferrato. He became a deacon in 1692, the same year he achieved the post of organist at S. Maria dei Servi in Bologna.