Hatsune Miku Fufu is a popular plush doll originating from Japan, whose official name is "soft plush doll" (Japanese: ふわふわfuwafuwaぬいぐるみ, abbreviated as ふわぬい; English: Fuwa Petit). Inspired by the virtual singer Hatsune Miku, the doll was launched by SEGA and designed by renowned artist March 8.

Hatsune Miku itself is a virtual singer character that is a library of audio sources developed by Crypton Future Media based on Yamaha's Vocaloid series of speech synthesis programs, and its audio source data is sampled from Japanese voice actress Saki Fujita. Since its release on August 31, 2007, Hatsune Miku has quickly amassed a large number of fans around the world with its unique musical charm and holographic projection technology.

As a derivative doll of Hatsune Miku, Fufu is characterised by a simple and cute expression and a soft touch. The facial expressions of the doll are designed to be very cute, so it is also affectionately called "silly fufu" by fans. This unique image design has made Fufu not only a favourite of Hatsune Miku fans, but also a favourite of many plush doll lovers.