Tilak Eranga Goonaratne (27 March 1919 – 4 February 2003) was a Sri Lankan civil servant and diplomat, who served as Sri Lankan High Commissioner to the United Kingdom and the European Economic Community.
Goonaratne graduated with a BA degree from the University of London and qualified as an Advocate of the Supreme Court of Ceylon.
Having joined the Ceylon Civil Service in 1943 as a cadet on appointment by the Governor of Ceylon, Goonaratne served several government departments and positions around the island including, Assistant Secretary, Ministry of External Affairs (1947–1951); Government Agent, Trincomalee (1951–1954); Government Agent, Matara (1954–1956); Registrar-General (1956–1958); Director General Broadcasting and Director of Information, Ceylon (1958–1960); Commissioner, Co-operative Development (1960–1963); Director of Economic Affairs (1963); Deputy Secretary to the Treasury (1963–1965).
He then served as Sri Lankan High Commissioner to the United Kingdom from 1970 to 1975.
He then served as Sri Lankan Ambassador to the European Economic Community from 1975 to 1978 with dual accreditation to Belgium.