Aleksi Emanuel Lehtonen (June 21, 1891, Uusikaupunki – March 27, 1951) was archbishop of Turku 1945–1951.
Lehtonen was ordained to priesthood on 10 June 1911. Later he was professor of pastoral theology in University of Helsinki, Bishop of Tampere 1934-1945 and archbishop of Turku 1945–1951.
Lehtonen was active in Ecumenical movement and sought Evangelical Lutheran Church of Finland to have closer relationship with Church of England.
His son Samuel Lehtonen became Bishop of Helsinki.