Ignatius Aloysius Reynolds (August 22, 1798 – March 6, 1855) was an American prelate of the Roman Catholic Church.

He served as bishop of the Diocese of Charleston, covering three states in the American South, from 1844 until his death in 1855.

Reynolds later became superior of the Sisters of Charity of Nazareth, and vicar general of the diocese.

He received his episcopal consecration on March 19, 1844, from Archbishop John Purcell, with Bishops Michael O'Connor and Richard Miles serving as co-consecrators, at Saint Peter in Chains Cathedral in Cincinnati, Ohio.

[1] Reynolds published a five-volume work on his popular predecessor, Bishop John England; erased the $14,000 diocesan debt left by England, and dedicated the Cathedral of Saint John and Saint Finbar in Charleston in April 1854.