Fusa Province

 was an ancient province of Japan, in the area of Shimōsa ("Lower Fusa") and Kazusa ("Upper Fusa") provinces. At the time of the establishment of Kazusa Province, it also included the southern tip of the Bōsō Peninsula that would later be split off as Awa Province. The ambit of this ancient entity is within Chiba Prefecture and Ibaraki Prefecture. It was sometimes called .
Although Fusa Province has been divided into Shimōsa and Kazusa since ancient times, a toponym "Fusa" has survived into modern times as the name of a village (布佐村 "Fusa-mura"), later a town (布佐町 "Fusa-machi"), which now forms the eastern part of Abiko City along the south bank of the Tone River. There is also a Fusa Station on the Abiko branch of JR East Japan's Narita Line, located in the Fusa neighborhood of Abiko City.