卡加延省（Cagayan）是菲律宾吕宋卡加延河谷政区的一个省份。首府为土格加劳市（Tuguegarao City），本省位于吕宋岛的最东北端。卡加延省还包括了北边的巴布延群岛。卡加延省西邻伊罗科斯北省、阿巴尧省，南面则是卡林阿省及伊莎贝拉省。卡加延省跟民答那峨岛上的卡加延德奥罗市没有关系，与巴拉旺省卡加延群岛的距离也很遥远。

Cagayan (/kɑːɡəˈjɑːn/ kah-gə-YAHN) is a province of the Philippines in the Cagayan Valley region in the northeast of Luzon Island, and includes the Babuyan Islands to the north. The province borders Ilocos Norte and Apayao to the west, and Kalinga and Isabela to the south. Its capital is Tuguegarao.