Izumi Kasagi (笠木 泉?, Kasagi Izumi; born January 4, 1976) is a Japanese actress/voice actress. She appears in several Japanese dramas, including acting as Kijima Yayoi in Namae wo nakushita onnatachi, Takahara Toshie in Joker: Yurusarezaru sôsakan, and appearing in The Solitary Gourmet. She also voices a parent in the Power Rangers movie Doubutsu Sentai Zyuohger the Movie: The Heart Pounding Circus Panic.

She is the Japanese voice of Mamimi Samejima in FLCL.