Bilateral is the second studio album by Norwegian progressive metal band Leprous.

Art direction and design by Ritxi Ostáriz.

In order to define the band's vision about music and what it means to be progressive, guitarist Tor Oddmund Suhrke provided his insight on this matter and other subjects in an interview with the monthly music magazine Guitar World.

[3] The album features guest vocals by Ihsahn[4] on the 4th track of the album, "Thorn", and the trumpet on "Thorn" and "Painful Detour" are played by Vegard Sandbukt.

Trumpet and additional keyboards were recorded in Kulturkirken Jacob, in Oslo by Rune Børø.