Three Days Grace
Three Days Grace in 2023 (L–R: Barry Stock, Neil Sanderson, Matt Walst, Adam Gontier and Brad Walst)
Background information
Also known as	Groundswell (1992–1995)
Origin	Norwood, Ontario, Canada
Genres	Post-grunge hard rock alternative rock alternative metal nu metal
Works	Three Days Grace discography
Years active	1992–1995 1997–present
Labels	Jive RCA
Members	Adam Gontier Neil Sanderson Brad Walst Barry Stock Matt Walst
Past members	Phil Crowe Joe Grant
Website	threedaysgrace.com

Three Days Grace is a Canadian rock band formed in Norwood, Ontario, in 1992 originally as Groundswell. Groundswell played in various local Norwood backyard parties and area establishments before disbanding in 1995 and regrouping in 1997 under its current name.

Based in Toronto, the band's original line-up consisted of guitarist and lead vocalist Adam Gontier, drummer and backing vocalist Neil Sanderson, and bassist Brad Walst. In 2003, Barry Stock was recruited as the band's lead guitarist, making them a quartet. In 2013, Gontier left the band and was replaced by Walst's younger brother Matt, who was a longtime songwriter for the band and was previously the lead singer of My Darkest Days. In 2024, Gontier officially rejoined the band with Walst also remaining as a singer, making them a dual-vocalist band, as well as a quintet for the first time since their genesis as Groundswell.

Currently signed to RCA Records, they have released eight studio albums: Three Days Grace in 2003, One-X in 2006, Life Starts Now in 2009, Transit of Venus in 2012, Human in 2015, Outsider in 2018, Explosions in 2022 and Alienation in 2025. The first three albums have been RIAA certified 2× platinum, 3× platinum, and platinum, respectively, in the United States. In Canada, they have been certified by Music Canada as platinum, triple platinum, and double platinum, respectively. In the United Kingdom, their second album One-X was certified silver by the British Phonographic Industry and gold by the Recorded Music NZ.^[1][2][3][4] The band has 19 No. 1 songs on the Billboard Hot Mainstream Rock Tracks chart and had 3 No. 1 hits on the Alternative Songs chart.

As of 2022, the band has sold over 10 million albums and singles combined worldwide.^[5]