Reyn (Rhein) Altin Johannes Lumenta or R.A.J. Lumenta (February 26, 1933 in Surabaya – September 28, 2003 in Jakarta) was the President and CEO of Garuda Indonesia, the Indonesian National Airline, in the period of 1984–1988, replacing Wiweko Soepono. Born in Surabaya, East Java, from a Manado ethnic family of Sulawesi, Lumenta grew up in Indonesia before continuing his education in the Netherlands. He graduated in “Vliegtuigbouw” from Hogere Technische School “Technicum” in Rotterdam in 1956. Having strong relation with Wagey and Saroinsong family clans.