Sydney Thomas Joseph Thompson (21 February 1906 – 1 August 1994) was an Australian politician who served as a Country Party member of the Legislative Council of Western Australia from 1960 to 1974.
He left school in 1921 and worked on his parents' farm until 1928, when he bought his own property.
Thompson entered parliament at the 1960 Legislative Council election, replacing Hugh Roche in South Province.
Following a redistribution, he was appointed to the new Lower Central Province in 1965, and was re-elected at the 1968 state election.
Thompson retired at the 1974 election and died in Narrogin in August 1994, aged 88.