Alexandra Tamposi (born November 17, 1989) is an American songwriter from West Palm Beach, Florida.

She is best known for co-writing Kelly Clarkson's song "Stronger (What Doesn't Kill You)," 5 Seconds of Summer's song "Youngblood", DJ Snake's "Let Me Love You" featuring Justin Bieber, Camila Cabello’s "Havana" featuring Young Thug, and Cabello's "Señorita" with Shawn Mendes.Tamposi appeared on the final season of The X Factor as vocal coach and mentor to Simon Cowell's team, working alongside groups Restless Road, Sweet Suspense, and winners Alex & Sierra.