| Type: | Bishop |
| Thomas Joseph Dowling | |
| Bishop of Peterborough | |
| Diocese: | Hamilton |
| Enthroned: | 1889 |
| Ended: | 1924 |
| Predecessor: | James Joseph Carbery |
| Successor: | John Thomas McNally |
| Ordination: | August 7, 1864 |
| Consecration: | May 1, 1887 |
| Other Post: | Bishop of Peterborough, Ontario (1886–1889) |
| Birth Date: | 28 February 1840 |
| Birth Place: | Shanagolden, County Limerick, Ireland |
| Death Place: | Hamilton, Ontario, Canada |
| Buried: | Holy Sepulchre Cemetery |
| Coat Of Arms: | Bishop Thomas Dowling Coat of Arms (Grave).jpg |
| Education: | St Michael's College, Toronto |
Thomas Joseph Dowling (28 February 1840 - 6 August 1924) was a Canadian Catholic priest and the second Bishop of the Catholic Diocese of Peterborough and the fourth Bishop of the Catholic Diocese of Hamilton, Ontario.
He was born in Ireland, and educated at St. Michael's College, Toronto. He was parish-priest at Paris, Ontario, for 22 years, administrator of the diocese of Hamilton in 1883, he was named bishop of Peterborough in 1887 and on May 1, received his episcopal consecration at St. Mary's Cathedral, Hamilton,[1] from Archbishop John Joseph Lynch, C.M., with Bishops James Joseph Carbery and Thomas Timothy O'Mahony serving as co-consecrators. He was transferred to the bishopric of Hamilton in 1889.