Larissa Joy Waters (born 8 February 1977) is an Australian politician. She is a member of the Australian Greens and has served as a Senator for Queensland since 2018. She previously served in the Senate from 2011 to 2017, resigning during the parliamentary eligibility crisis due to her holding Canadian citizenship in violation of Section 44 of the Constitution of Australia. Waters serves as her party's Senate leader, in office since February 2020. She previously served as co-deputy leader from May 2015 to July 2017 and again from December 2018 to June 2022.