Oliver Weerasinghe, OBE, FRIBA (29 September 1907 – 20 January 1980) was a Sri Lankan architect and diplomat. He was Sri Lanka's first City Planner and for this reason, he is referred to as the "Father of Sri Lanka's Town Planning". He is a former Ambassador to the United States. In 1956, he joined the United Nations and was later appointed as Sri Lanka's Ambassador to the United States. During his tenure, he established four consulates and the Buddhist Temple of Washington, D.C. Weerasinghe died at Viharamahadevi Park, aged 72, after suffering a heart attack during a morning walk.