Clytus Arnold Thomasos was a Trinidad and Tobago politician and the longest-serving Speaker of the House of Representatives.
Thomasos was born on 23 July 1906 in Arima. In the elections of 1956, he was People's National Movement's candidate for Arima constituency. He was elected as member of the Legislative Council of Trinidad and Tobago from 1956 to 1961. In October 1956 he was elected as deputy speaker of the Legislative Council. 
Thomasos was elected Speaker of the House of Representatives on 29 December 1961. He served almost 20 years until November 1981, when he retired due to ill health. 
He died on 20 December 1990. 
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