Lily of da Valley is the fourth full-length album by Japanese rap rock group Dragon Ash; released in 2001.

The album was preceded by the release of three singles, including "Shizuka na Hibi no Kaidan o", which was used as the ending theme for the 2000 film Battle Royale.

Ted Mills of AllMusic called the album a step down from Dragon Ash's preceding album Viva la Revolution (1999), writing that it was disappointing that the band's success following that album had "narrowed their focus" into making either "hardcore metal/hip-hop" tracks like "Let Yourself Go, Let Myself Go", or "soulful hip-hop" tracks with "female backing vocals" that follow the formula of another of their hits, "Grateful Days".

While conceding that this does not mean the tracks "aren't exciting", Mills concluded it did mean that "the group has decided to turn the amps up to 11 without moving ahead".

[2] It was eventually certified double platinum by the Recording Industry Association of Japan in March 2001, for shipments of 800,000 copies.