The Most Reverend John Martin Henni | |
|---|---|
| Archbishop of Milwaukee | |
 | |
| See | Milwaukee |
| Installed | November 28, 1843 |
| Term ended | September 7, 1881 |
| Predecessor | none |
| Successor | Michael Heiss |
| Orders | |
| Ordination | February 2, 1829 |
| Consecration | March 19, 1844 |
| Personal details | |
| Born | June 15, 1805 Misanenga, Obersaxen, Graubünden, Switzerland |
| Died | September 7, 1881 (aged 76) Milwaukee, Wisconsin, United States |
| Denomination | Roman Catholic Church |
| Signature | .png){kind=small} |
John Martin Henni (June 15, 1805 – September 7, 1881) was a Swiss-born prelate of the Roman Catholic Church who served as the first Archbishop of the Archdiocese of Milwaukee, Wisconsin from 1843 until his death in 1881.