Junko Nakajima (中島 淳子, Nakajima Junko, born 2 May 1952), more commonly known by her stage name Mari Natsuki (夏木 マリ, Natsuki Mari), is a Japanese singer, dancer and actress. Born in Tokyo, she started work as a singer from a young age. In 2007, Natsuki announced her engagement to percussionist Nobu Saitō, with their marriage taking place in Spring 2008.
Natsuki 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. Natsuki played the character Big Mama in the Japanese version of Metal Gear Solid 4: Guns of the Patriots and has also acted in television dramas, such as the 2005 series Nobuta o Produce, playing the Vice Principal, Katharine.