The Birthday Massacre (abbreviated TBM) is a Canadian band, formed in 1999 in London, Ontario, and currently based in Toronto, Ontario. The current line-up consists of Chibi (vocals), Falcore (guitars), Rainbow (guitars), Owen (synthesizers), Nate Manor (bass guitar) and Rhim (drums).

When the band formed in 1999, they were known as Imagica. This name was inspired from the fantasy novel Imajica (1991) by Clive Barker. In 2002, they changed the name to The Birthday Massacre after one of their earlier songs in order to avoid confusion with another group. The song "The Birthday Massacre" was then renamed to "Happy Birthday". According to their vocalist Chibi: "it kind of works well for the music that we're making. Sort of contrasty, you know? Birthday, and massacre. Light, and dark. Cute, and evil".

TBM have released six studio albums: Nothing and Nowhere (2002), Violet (2005), Walking With Strangers (2007), Pins and Needles (2010), Hide and Seek (2012), and Superstition (2014). Their seventh studio album will be released January 2017.

They also issued the DVD Blue (2005), the live album/DVD Show and Tell (2009), the demo album Imagica, and the EPs Violet (2004), Looking Glass (2008), Imaginary Monsters (2011).