G. Wallace La Rue, 70, a retired Foreign Service officer who had lived in the Washington area off and on since his early 1950s, died Monday at his home in McLean. He had emphysema.

His last post was that of consul general in Turin, Italy, where he served from 1961 until retiring in 1965. He had assignments at the State Department in Washington from 1952 to 1954 and again from 1957 to 1961.

Mr. La Rue was born in Moberly, Mo. He was a graduate of the University of Missouri, where he also earned a law degree in 1936. He entered the Foreign Service a year later.

He was assigned to Ottawa, Canada, Bombay, India, and, in 1942, to Algiers, where he contracted tuberculosis, necessitating a leave of absence. In 1947, he was sent to Ciudad Juarez, Mexico, as consul. Other later assignments included Panama and Zurich, Switzerland.

Mr. La Rue lived here from 1965 until his marriage in 1970 to the former Luisa Costa Hall. They made their home in Barcelona, Spain, until returning to this area in 1973.

In addition to his wife, he is survived by two sisters, Mrs. O. C. Daggertt of Sterling, Ill., and Joyce La Rue of New York City.

The family suggests that expressions of sympathy be in the form of contributions to the DACOR Education and Welfare Fund in Washington.