Peter Robert Gray (10 May 1980 – 30 April 2011) was an Australian environmental activist, notable for two landmark court cases, and for having thrown his shoes in public at former Prime Minister of Australia John Howard in protest over Australia's participation in the 2003 invasion of Iraq. He was described in an obituary in the Sydney Morning Herald as "a pleasure-loving intellectual" driven by "an instinctive anti-authoritarianism bordering on the larrikin".