Junko Nakajima, more commonly known by her stage name Mari Natsuki, is a Japanese singer, dancer and actress. Born in Tokyo, she started work as a singer from a young age. In 2007 she announced her engagement to percussionist Nobu Sait?, with their marriage taking place in Spring 2008.
She has participated in musical theatre, including that of Yukio Ninagawa. She provided the voice of Yubaba in Spirited Away, played the young witch's mother in the Japanese TV remake of Bewitched, and has twice been nominated for a Japanese Academy Award. She plays the character Big Mama in the Japanese version of Metal Gear Solid 4: Guns of the Patriots. She has also acted in television dramas, such as the 2005 series Nobuta o Produce, in which she played the Vice Principal, Katharine.