Martin Plaza is the pseudonym of Martin Edward Murphy (born 1 January 1956), who is a vocalist/guitarist/songwriter with Australian pop/new wave band Mental As Anything. Plaza also has a solo music career and in 1986 had a No. 2 hit in Australia with his cover of the 1960s Unit 4+2 song "Concrete and Clay". Plaza has worked in other bands and is an accomplished artist.
Plaza was born Martin Murphy on the North Shore of Sydney. He attended St. Pius X at Chatswood, excelling in sporting and artistic pursuits but showing little interest in other subjects. After attending Hornsby Technical College he switched with fellow student Steve Coburn to what was then known as the East Sydney Technical College (now known as the National Art School) in Darlinghurst in the mid-1970s where he met Chris O'Doherty. Around this time he was working part-time at KFC. With O'Doherty (later known as Reg Mombassa), Coburn and another student, David Twohill, he formed the pop/rock band Mental As Anything in May 1976. Mental As Anything went on to become one of Australia's most popular bands touring widely in Australia and overseas.