My Darkest Days was a Canadian rock band based in Peterborough, Ontario, consisting of lead vocalist Matt Walst, bassist Brendan McMillan, drummer Doug Oliver, guitarist Sal Costa, and keyboardist Reid Henry. They were discovered by Chad Kroeger of Nickelback, who signed them to his record label, 604 Records. They are best known for their 2010 single "Porn Star Dancing".

In June 2010 the band went on tour with Sick Puppies, Janus, and It's Alive, and shot the video for "Porn Star Dancing" in Las Vegas. In August 2010, they toured with Trapt, Skillet, and Papa Roach. Chad Kroeger appears and sings in the "Porn Star Dancing" video, as does American rapper Ludacris (in the extended version only) and Black Label Society frontman Zakk Wylde, playing lead guitar for the single.

The band disbanded in 2013 after Matt Walst became the lead vocalist of Three Days Grace, which also features his older brother Brad.