John McGill (November 4, 1809 – January 14, 1872) was an American prelate of the Roman Catholic Church.

[1] Despite his great financial success as a lawyer, McGill decided to resume his preparation for the priesthood by entering St. Mary's Seminary in Baltimore, Maryland.

[3] He received his episcopal consecration on November 10, 1850, in Bardstown from Archbishop Peter Kenrick, with Bishops Richard Miles and Martin Spalding serving as co-consecrators.

To fill the gap, McGill wrote, "The True Church Indicated to the Inquirer" and "Our Faith, the Victory", republished as "The Creed of Catholics".

In 1867, McGill brought the Sisters of Charity from Emmitburgh, Maryland, to set up a school in the diocese.

An accomplished speaker, McGill addressed congregations in Cincinnati, Charleston, Louisville, and Baltimore, as well as in Paris and Rome.