René Letelier Martner (1915–2006) was a Chilean chess player with the title of International Master.
[2] In tournaments, Letelier tied for 11-12th at Mar del Plata 1936 (Isaías Pleci won).
In 1945, he tied for 2nd-5th with Carlos Skalicka, Enrique Reinhardt and Moshe Czerniak in Quilmes (Gideon Ståhlberg won).
In 1946, he tied for 1st with Skalička, followed by Movsas Feigins, Jorge Pelikán, etc., in Buenos Aires (Circulo La Regence).
In 1951, he took 8th in Mar del Plata/Buenos Aires (1st zonal; Erich Eliskases and Julio Bolbochán won).
In 1954, he won, ahead of joint runners-up Ossip Bernstein and Miguel Najdorf, at the Gran Torneio Internacional Unesco in Montevideo (18 players).
In 1957, he tied for 7-8th in Rio de Janeiro (3rd zonal; Oscar Panno won).
In 1960, he took 7th in Mar del Plata (Boris Spassky and Bobby Fischer won).
In 1964, he tied for 17-18th in Havana (3rd Capablanca Memorial; Vasily Smyslov and Wolfgang Uhlmann won).
In 1969, Letelier won the 2nd edition of the annually played international Mar del Plata Open.