Frosinone Calcio () is an Italian football club based in Frosinone, Lazio. The club was founded on 5 March 1906 under the name Unione Sportiva Frusinate, but conventionally the year 1928 is indicated as the beginning of competitive activities of significant importance. Following cancellation by the Italian Football Federation, it was refounded in 1959 and in 1990. In the 2014–15 season the club played in Serie B for the sixth time in its history. The club earned its first promotion to the top flight Serie A in the 2015–16 season, but were relegated back down to Serie B after just one season. In the 2018–19 season it was promoted to Serie A for a second time.