Asahel Nettleton (April 21, 1783 – May 16, 1844) was an American theologian and Evangelist from Connecticut who was highly influential during the Second Great Awakening.
The number of people converted to Christianity as a result of his ministry was estimated by one biographer at 30,000.
He participated in the New Lebanon Conference in 1827, during which he and Lyman Beecher opposed the teachings of Charles Grandison Finney.