| Type: | Bishop |
| Honorific Prefix: | The Right Reverend |
| John Nicholas Galleher | |
| Honorific Suffix: | S.T.D., D.D. |
| Church: | Episcopal Church |
| Diocese: | Louisiana |
| Elected: | 1879 |
| Term: | 1880–1891 |
| Retired: | --> |
| Predecessor: | Joseph Pere Bell Wilmer |
| Successor: | Davis Sessums |
| Ordination: | May 30, 1869 |
| Ordained By: | Joseph Pere Bell Wilmer |
| Consecration: | February 5, 1880 |
| Consecrated By: | William Mercer Green |
| Birth Date: | 17 February 1839 |
| Birth Place: | Washington, Kentucky, U.S. |
| Death Place: | New Orleans, Louisiana, U.S. |
| Buried: | Cave Hill Cemetery Louisville, Kentucky, U.S. |
| Nationality: | American |
| Parents: | Corbin Galleher & Elizabeth Johnson Riley |
| Spouse: | Charlotte Barbee |
| Children: | 5 |
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John Nicholas Galleher (February 17, 1839 – December 7, 1891) was third bishop of the Episcopal Diocese of Louisiana from 1880 to 1891.
Galleher was born on February 17, 1839, in Washington, Kentucky, to Corbin Galleher, a merchant and inn keeper, and Elizabeth Johnson Riley. He received his early education at Maysville, Kentucky and attended the University of Virginia from 1856 and 1858. Galleher served in the Confederate army under Simon Bolivar Buckner. After the war he commenced studies in Theology and practiced law in Louisville, Kentucky after which he attended the General Theological Seminary. In 1875 he earned the Doctor of Divinity from Columbia University.
Galleher was ordained a deacon on June 7, 1868, in Christ Church Cathedral in Louisville, Kentucky by Bishop George David Cummins. He served as assistant in Christ Church Louisville. On May 30, 1869, he was ordained a priest by Bishop Joseph Pere Bell Wilmer of Louisiana in Trinity Church, New Orleans after which he became rector of the same church, a post he held till 1871. Later he was appointed rector of Memorial Church in Baltimore and then rector of Zion Church in New York City.[1]
Galleher was elected Bishop of Louisiana and consecrated on February 5, 1880, by Bishop William Mercer Green of Mississippi, and co-consecrated by Richard Hooker Wilmer of Alabama, Charles Franklin Robertson of Missouri and Thomas Underwood Dudley of Kentucky. Galleher is mostly remembered as the minister who administered the last rites to Jefferson Davis. He died on December 7, 1891, in New Orleans, Louisiana.
Galleher married Charlotte Barbee in 1868 and together had 5 children.
Perry, William Stevens: John Nicholas Galleher. In: Episcopate in America - Sketches Biographical & Bibliographical of the Bishops of the American Church. 1895, p. 262-263.