Izumi Province was a province of Japan in the area of southern Osaka Prefecture. It bordered on Kii to the south, Yamato and Kawachi to the east, and Settsu to the north. Its abbreviated form name was Senshū (泉州). In terms of the Gokishichidō system, Izumi was one of the provinces of the Kinai circuit. Under the Engishiki classification system, Izumi was ranked as one of the "inferior countries" (下国) in terms of importance. The provincial capital was located in the Fuchi neighborhood of what is now the city of Izumi. The ichinomiya of the province is the Ōtori taisha also located in Sakai.

The Hosokawa clan is a Japanese Samurai kin group or clan.