Malcolm Ieuan Roberts (born 3 May 1955) is an Australian politician for Pauline Hanson's One Nation.
He sat as a member of the Australian Senate, representing Queensland, until his 2016 election was declared invalid by the High Court of Australia in 2017.
He was then elected Senator for Queensland in the 2019 Australian federal election.
Before going into politics, Roberts was a coal mining engineer and a businessman.
Roberts is also famous for his climate change denial, and his advocacy of climate conspiracy theories.