Cassino is a comune in the province of Frosinone, Southern Italy, at the southern end of the region of Lazio, the last city of the Latin Valley.

The province of Frosinone is a province in the Lazio region of Italy. Its capital is the city of Frosinone. It has an area of 3,247 square kilometres (1,254 sq mi) and a total population of 493,605 (2016). The province contains 91 comuni, listed in the comuni of the province of Frosinone.