John Clinton Loehlin (January 13, 1926 – August 9, 2020) was an American behaviorial geneticist, computer scientist, and psychologist.

Loehlin served as president of the Behavior Genetics Association and of the Society of Multivariate Experimental Psychology.

He was on active service in the United States Naval Reserve in 1951-53 during the Korean War.

In 1994 he was one of 52 signatories on "Mainstream Science on Intelligence",[1] a public statement written by Linda Gottfredson, published in response to popular criticism of the conclusions presented in Richard J. Herrnstein and Charles Murray's controversial book The Bell Curve (1994).

In 1995, he took part in the American Psychological Association task force writing a consensus statement on the state of intelligence research in response to the claims being advanced amid the Bell Curve controversy, titled "Intelligence: Knowns and Unknowns."