Killswitch Engage (often abbreviated as KsE or Killswitch) is a metalcore band from Westfield, Massachusetts. Formed following the disbandment of the bands Overcast and Aftershock, Killswitch Engage's lineup consists of vocalist Howard Jones, bassist Mike D'Antonio, guitarists Joel Stroetzel and Adam Dutkiewicz, and drummer Justin Foley. Signed to Roadrunner Records, Killswitch Engage has released four studio albums and one DVD.

Killswitch Engage(they have awsome chords) rose to fame with its 2004 release The End of Heartache, which peaked at number 21 on the Billboard 200, and was certified gold in December 2007 for over 500,000 shipments in the United States. The title track, "The End of Heartache", was nominated for a Grammy Award in 2005, and a live DVD titled (Set This) World Ablaze was released in 2005. Killswitch Engage attended Reading and Leeds Festivals, Ozzfest, Download Festival, the Warped Tour, and Rock on the Range, and continued touring until May of 2008 in support of their As Daylight Dies album.

The band is considered one of the most influential members of the New Wave of American Heavy Metal.