Peter Alexander Walsh AO (11 March 1935 – 10 April 2015) was an Australian politician. He was a Senator for Western Australia from 1974 to 1993, representing the Australian Labor Party (ALP). He held senior ministerial office in the Hawke government, serving as Minister for Resources and Energy (1983–1984) and Minister for Finance (1984–1990).

Walsh was born on 11 March 1935 in Kellerberrin, Western Australia, the second son of Dorothy (née Ray) and Robert Walsh. His parents had moved from Victoria a few years earlier to take up a lease on a sheep and wheat farm at Doodlakine in the Wheatbelt.^[1]

Walsh attended Doodlakine Primary School and completed his junior certificate by correspondence, leaving school in 1948 at the age of 13 to work on the family farm. He was active in the Junior Farmers' Federation and the Farmers' Union of Western Australia.^[1] In 1950 Walsh led the Doodlakine debating team to victory at the state championship.^[2] He enrolled in the University of Western Australia in the late 1960s as an external student in economics, although he did not complete a degree.^[1]

After leaving politics, Walsh was a columnist for the Australian Financial Review and was particularly critical of environmentalism. He was one of the founders of the Lavoisier Group which opposes the Kyoto protocol on global warming. Walsh also expressed criticism over the Rudd government's National Broadband Network scheme.^[7]

Walsh died at a hospital in Perth after a short illness on 10 April 2015.^[8]

In his tribute to him, sitting Liberal Finance Minister and another WA Senator Mathias Cormann described his predecessor as "a real pillar of the Hawke Government".^[9]