What anime is hatsune miku in?

Hatsune Miku (Vocaloid) and Runo (Bakugan) sister

I don't think she's in any anime, actually. She's a Vocaloid. She sings. That's about it.

Hatsune Miku isn't in an anime. She's something of a virtual idol for the music company Vocaloid. There are others like her, though she's the most famous.

As the other answers say, she´s vocaloid, but appears in these anime:
Baka to test to shoukanjuu episode 11, Hyouka episode 12-16, Accel world episode 21, MM! episode 9, Lucky star OVA, Kaempfer episode 7, Maria holic episode 12, Un-go episode 1, Himouto! Umaru-chan episode 1, Zoku Sayonara Zetsubou Sensei episode 13,

Miku Hatsune isn't in any anime, she's in a virtual singing Japanese group, called Vocaloid, so is Len, Rin, etc, Miku Hatsune was made for preformances, and songs, she's also in this program thing, it could be called a game called, Miku Miku dance, or for short MMD

All you gotta do is Google all your information. Krypton Future Media created Hatsune Miku Hatsune Miku is a Vocaloid that and Music. Miku is known as first sound of the future. And she is a software programcreates for fans to make music of her. And short Anime like videos called MMD Miku Miku Dance. Also Hatsune Miku has Manga Bok series and Video Game series. If you wanna know more go to this Google link to learn about Hatsune Miku.link also the picture is Hatsune Miku in her Avant-Garde dress/Module outfit from my Hatsune Miku Project Diva F 2nd Video Game. :3