John Clinton Loehlin (January 13, 1926 – August 9, 2020) was an American behavior geneticist, computer scientist, and psychologist. Loehlin served as president of the Behavior Genetics Association and of the Society of Multivariate Experimental Psychology. He was an ISIR lifetime achievement awardee. Even after retirement, he remained active in research and publishing. His book on Latent variable models (now in its fourth edition) remains very popular. He was a keen poet. His son is the American author and scholar James Loehlin.