Kathleen Hanna (born November 12, 1968) is an American musician, feminist activist, and punk zine writer. In the early- to mid-1990s she was the lead singer of feminist punk band Bikini Kill, before fronting Le Tigre in the late 1990s and early 2000s. In 1998, Hanna released a lo-fi solo album under the name Julie Ruin and since 2010 has been working on a project called The Julie Ruin.
A documentary film about Hanna was released in 2013 by director Sini Anderson, titled The Punk Singer, detailing Hanna's life and career, as well as revealing her years-long battle with Lyme disease. Hanna is married to Adam Horovitz of the Beastie Boys.