Olli Kristian Lokki (Lindeqvist) (28 April 1916 – 6 March 1994) was a Finnish mathematician.
His thesis was in the field of function theory, with the title Über analytische Funktionen deren Dirichletintegrale endlich ist und die in gegebenen Punkten vorgeschriebene Werte annehmen.
After the war, Lokki became an assistant at the Department of Mathematics at the University of Helsinki, and after working as a vocational school teacher for one academic year, he was appointed a lecturer in mathematics at the Helsinki University of Technology in 1945 and held this position until 1953.
From 1962 until his retirement in 1979, Lokki was a professor of applied mathematics at the Helsinki University of Technology.
[1] In his teaching, Lokki particularly promoted the application of statistical and operations research methods to the solution of practical problems.