Sarah Elizabeth "Sadie" Dupuis (born July 8, 1988) is an American musician who is the guitarist, lead vocalist and lyricist for the band Speedy Ortiz.

Before becoming a full-time musician, she worked as a freelance writer, taught writing courses, and got her MFA in poetry at University of Massachusetts Amherst.

Also during 2011, Dupuis played in "the all-female Pavement cover band" Babement,[19] formed with Cindy Lou Gooden of Very Fresh;[20] however, they only performed a "couple shows.

Dupuis quit her teaching job and became a full-time musician while preparing for the release of Speedy Ortiz's second album, Foil Deer.

[22] Dupuis has featured on numerous tracks by Exploding in Sound bands Ovlov and Mister Goblin, providing backing vocals.

[23][24][25] She has also worked with a range of artists as a producer, synth player, or guitarist, including Backxwash,[26] Ben Lee,[27] Field Mouse (band),[28] Tracy Bonham,[29] Lushlife[30] and Eric Slick.

[6] While Dupuis played most of the instruments other than drums and orchestral contributions, it featured vocal performances from Helado Negro, Satomi Matsuzaki and Merrill Garbus.

[7] In an essay for Talkhouse, Dupuis described the book as about grief, harm reduction, and said it "grapples with [her] work as a musician—all the icky moments the artist-unfriendly industry inflicts, and all the ways music and its communities have given [her] reasons to live.

"[45] It received positive reviews from Publishers Weekly, Ploughshares and Autostraddle,[46][47][48] was listed as a best book of the year by Rough Trade (shops) and Two Dollar Radio,[49] and was praised by authors Hanif Abdurraqib, Eileen Myles and Wendy Xu.

In 2020, Wax Nine began to publish an online poetry and art journal, which has featured writing from Melissa Lozada-Oliva, Jenny Zhang, and Richard Chiem.