Janet Lee Weiss (born September 24, 1965) is an American rock drummer, a member of Quasi and former member of Sleater-Kinney. She was the drummer for Stephen Malkmus and the Jicks, leaving after the album Mirror Traffic, and contributed to the Shins' fourth studio album, Port of Morrow (2012). She was also the drummer for the supergroup Wild Flag.

Weiss is highly regarded as a drummer; Stylus Magazine listed her in 2007 as number 48 of rock's 50 greatest drummers, while in 2014 LA Weekly placed her at number 12 in the top 20. In 2016, Rolling Stone placed her at number 90 on its list of the 100 Greatest Drummers of All Time, and in 2018, New Musical Express ranked her as number 25 of the top 32 rock drummers.