Slow Mass is an American band from Chicago, Illinois, formed in 2015. The group features musicians who have also played in Into It. Over It., Damiera, and other Midwest indie and punk projects. Their name is taken from a Glenn Branca composition. The band’s music has been described through tags such as post-hardcore, indie rock, post-rock, and alternative. Slow Mass released the EP Treasure Pains in 2016 and their debut full-length On Watch in 2018. More recent releases include Low on Foot and the 2025 single "GBP." Live, the group is known for a fluid lineup and a performance style that draws from dense guitar textures, shifting dynamics, and layered vocals.