Rajeshwar Dayal (1909–1999) was an Indian diplomat, writer, Ambassador of India to the former state of Yugoslavia and the Head of the United Nations Operation in the Congo. Born on 12 August 1909, Dayal was one of the earlier officers of the Indian Foreign Service. He served as the Indian ambassador to the now defunct Yugoslavia from 1955 to 1958 and moved to the UN as a member of the United Nations Observation Group in Lebanon (UNOGIL) when the organization was established in 1958.