Louise Clare Pratt (born 18 April 1972) is an Australian politician who has been a Senator for Western Australia since 2016, and previously from 2008 to 2014. She is a member of the Labor Party, and served as a member of the Western Australian Legislative Council from 2001 to 2007. She was the youngest woman ever elected to the Legislative Council at the time of her election, the second open lesbian to be elected to an Australian parliament, and was the first to have a transgender man as a partner.