Malcolm Ieuan Roberts (born 3 May 1955) is a far-right Australian politician. He is a member of One Nation and has been a Senator for Queensland since 2019. He also served in the Senate from 2016 to 2017. Roberts is known for his climate change denial, and has been a proponent of fringe global warming conspiracy theories. Prior to his election to the Senate he founded the Galileo Movement to lobby against the Gillard government's carbon pricing legislation. He has also been associated with anti-globalism and opposition to the United Nations.