Momoko Tsugunaga (嗣永 桃子, Tsugunaga Momoko, born 6 March 1992) is a Japanese pop singer and the playing manager of the idol group Country Girls. She has also been a member of smaller groups composed of Hello! Project Kids members; ZYX and Berryz Kobo, and taking the role of leader of Buono!.
Tsugunaga joined Hello! Project in 2002 at the age of 10 with the other 15 Hello! Project Kids.
In 2004, Berryz Kobo was created, and Tsugunaga was selected as one of the group's members.
In 2007, she was selected together with °C-ute member Airi Suzuki, and fellow Berryz Kobo member Miyabi Natsuyaki for the Hello! Project sub-group Buono!, which mainly produced opening and ending songs for the anime Shugo Chara!, but has now gone on to release more singles.