Masami Nagasawa (長澤まさみ) is a Japanese actress represented by Toho Entertainment. She has appeared in many well-known films and television series, including "Crying Out Love in the Center of the World," "Nada Sousou," "The Dragon Zakura" and "The Proposal Daisakusen." In 2006 she graduated from Horikoshi High School.

She is also known as "Ma-chan," and Tomohisa Yamashita calls her "Maa-tan." On her radio show she introduces herself as "Gasawa," a nickname chosen by fans. She is the daughter of Kazuaki Nagasawa, a former manager of the J-League team Júbilo Iwata.