Thorleif Enger (born 1943) is a Norwegian businessperson and was Chief Executive Officer of Yara International. Dr. Enger is educated at the University of Colorado where he earned his PhD in Structural Engineering. He worked for Royal Dutch Shell until 1973, after which he moved to Norway to work for Norsk Hydro. He was director of the Oseberg oil field 1982–86, and from then until 1996 was president of the exploration and production division.