Seemless was an American rock supergroup formed by ex-Shadows Fall/Unearth drummer Derek Kerswill, Killswitch Engage vocalist Jesse Leach, and ex-Overcast/Killswitch Engage guitarist Pete Cortese.

Formed in 2002 following Leach's departure from Killswitch Engage, Seemless was signed to Equal Vision Records, and released their first self-titled LP. They toured extensively over the next year, quickly making a mark on the rock/metal scene with their mixture of soul and blues elements. After the release of their last album, What Have We Become, the band has toured with Nonpoint, Trivium, In Flames, Soil, Fu Manchu, Lacuna Coil, and several others.