Albert Barnes (December 1, 1798 – December 24, 1870) was an American theologian, born in Rome, New York. He graduated from Hamilton College, Clinton, New York, in 1820, and from Princeton Theological Seminary in 1823. Barnes was ordained as a Presbyterian minister by the presbytery of Elizabethtown, New Jersey, in 1825, and was the pastor successively of the Presbyterian Church in Morristown, New Jersey (1825–1830), and of the First Presbyterian Church of Philadelphia (1830–1868).
Albert Barnes held a prominent place in the New School branch of the Presbyterians during the Old School-New School Controversy, to which he adhered on the division of the denomination in 1837; he had been tried (but not convicted) for heresy in 1836, mostly due to the views he expressed in Notes on Romans (1834) of the imputation of the sin of Adam, original sin and the atonement; the bitterness stirred up by this trial contributed towards widening the breach between the conservative and the progressive elements in the church.
During the Old School-New School split in the Presbyterian Church in the United States of America, Barnes allied himself with the New School Branch. He served as moderator of the General Assembly to the New School branch in 1851. He was an eloquent preacher, but his reputation rests chiefly on his expository works, which are said to have had a larger circulation both in Europe and America than any others of their class.