Niilo Heikki Antero Leppo (8 November 1906 Vihti – November 16, 1987 ) was a Finnish diplomat. He worked in Switzerland from 1946 to 1948 as Chargé d'Affaires of Finland.Ulkoministeriö. He was appointed Envoy to Buenos Aires in 1955 and in 1957 he received the ambassador's status.
From 1961, he was the rapporteur for the ambassadors.Otavan Iso tietosanakirja, osa 5, palsta 533. Otava 1968. and 1964-1974 Finland's Ambassador to BrazilUlkoministeriö.
His brother was economist Matti Leppo.
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