Mask is the seventh studio album by Japanese singer-songwriter Aco, released on 22 February 2006.

It is a mini-album consisting of six songs and with a total playing time of 25 minutes.

Mask marks a significant transition in Aco's style from ambient, electronic sounds of her previous two albums, Material and Irony, to lighter, electro-pop music.

[1] Track 3 is a cover of the song of the same name by The Waitresses.

This article about a Japanese album is a stub.