Thomas Heslin (April 17, 1847 – February 22, 1911) was an Irish-born prelate of the Roman Catholic Church who served as bishop of the Diocese of Natchez in Mississippi from 1889 until his death in 1911.

[1] Upon the completion of his classical studies in Granard, Ireland, he came to the United States at the invitation of Archbishop Jean-Marie Odin in 1863.

[2] Heslin was ordained to the priesthood for the Diocese of St. Louis by Bishop John Quinlan on September 8, 1869.

[1] On March 29, 1889, Heslin was appointed the fifth Bishop of the Diocese of Natchez by Pope Leo XIII.

[3] He received his episcopal consecration on June 18, 1889, from Archbishop Francis Janssens, with Bishops Edward Fitzgerald and Anthony Durier serving as co-consecrators.