Samuel Matthew Piantadosi (April 1946 - 4 March 2010) was an Australian union official and politician. A senior Western Australian union official and the founding chairman of the Ethnic Communities Council in the 1980s, he was elected as an Australian Labor Party member of the Western Australian Legislative Council at the 1983 state election. His election made him the first post-war Italian migrant to be elected to the Parliament of Western Australia.