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. She has also released two solo albums, Slugger and Haunted Painting, under the name Sad13. Dupuis has published two books of poetry. A portrait of her was featured on the August 22, 2022 cover of The New Yorker. In October 2023, Rolling Stone included Dupuis on its 250 Greatest Guitarists of All Time list.
