Lenski was awarded a Pre-doctoral Fellowship by the Social Science Research Council, 1949–50, and later a Senior Faculty Fellowship, 1961–62; a Guggenheim Fellowship, 1972–73; and IREX Senior Faculty Exchange Fellowships, for Poland, 1978, and Hungary, 1988. He served as Vice President of the American Sociological Association, 1969–70, and was nominee for President in 1972. He was also President of the Southern Sociological Society, 1977–78 and elected Fellow of the American Academy of Arts and Sciences, 1976. In 2002, he was awarded the Career of Distinguished Scholarship Award by the American Sociological Association.