Asahel Nettleton (April 21, 1783 – May 16, 1844) was an American theologian and pastor 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.
Nettleton was born 1783 into a farming family in Connecticut. During his early years, he occasionally experienced religious impressions. "One evening while standing alone in a field, he watched the sun go down. The approaching night reminded him that his own life would some day fade into the darkness of the world beyond. He suddenly realized that he, like all other people, would die." These impressions were only temporary.
In the autumn of 1800 Nettleton came under powerful conviction of sin. This conviction deepened as he began to read the writings and sermons of Jonathan Edwards, but yet he remained unconverted. It was in 1801 that a revival came to North Killingworth, and by December of that year, 32 new converts were added to the Church; by March 1802 "the congregation had been swelled by ninety-one professions." Among them was Nettleton, who, becoming "exceedingly interested" in missions societies soon had "a strong desire to become a missionary to the heathen."
He attended Yale College from 1805 until his graduation in 1809 and was ordained to the ministry in 1811.
Nettleton led many Congregationalist revivals in New England in the first decade of his ministry. Operating in contrast to many modern evangelists, he would often move into a community for several weeks or months and study the spiritual condition of the people before attempting any revival work. His preaching was said to be largely doctrinal but always practical. Nettleton often filled the pulpits of churches where there was no pastor present. This allowed him to engage in a pastoral care for the people. This practice is typically absent in modern evangelists' ministries. He also refused to preach in any community where he had not been invited. He witnessed early in ministry the problems that can result from a pastor who feels as though he is competing with an evangelist. He also would sometimes refuse to preach in a church if he believed the request was not sincere. He rejected the idea that he was the cause of any revival and shunned those who looked to him rather than God to bring revival to their community.