| Tioga River | |
| Pushpin Map: | New Hampshire#USA |
| Pushpin Map Size: | 250 px |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New Hampshire |
| Subdivision Type3: | Counties |
| Subdivision Name3: | Belknap, Merrimack |
| Subdivision Type4: | Towns |
| Subdivision Name4: | Gilmanton, Belmont, Northfield |
| Length: | 12.8miles |
| Source1 Location: | Gilmanton |
| Source1 Coordinates: | 43.4667°N -71.405°W |
| Source1 Elevation: | 1130feet |
| Mouth: | Winnipesaukee River |
| Mouth Location: | Belmont |
| Mouth Coordinates: | 43.4533°N -71.5458°W |
| Mouth Elevation: | 465feet |
| Tributaries Left: | Badger Brook, Pumping Station Branch |
The Tioga River is a 12.8adj=midNaNadj=mid[1] river located in the Lakes Region of central New Hampshire in the United States. It is a tributary of the Winnipesaukee River, part of the Merrimack River watershed.
The Tioga River rises on the western slopes of the Belknap Mountains in Gilmanton, New Hampshire. Flowing west, the river quickly enters the town of Belmont, where it spends most of its existence. The river passes through Badger Pond shortly before reaching the village proper of Belmont, which was sited along the Tioga River in the 19th century for its waterpower. The river continues west, reaching a broad wetland along the Belmont-Northfield town line, and ends at the Winnipesaukee River near the outlet of Silver Lake.
New Hampshire Route 140 follows the general course of the river from Belmont village to the Winnipesaukee.