| Squam 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: | Grafton, Belknap |
| Subdivision Type4: | Towns |
| Subdivision Name4: | Ashland, New Hampton |
| Length: | 3.6miles |
| Source1: | Little Squam Lake |
| Source1 Location: | Ashland |
| Source1 Coordinates: | 43.7186°N -71.6186°W |
| Source1 Elevation: | 570feet |
| Mouth: | Pemigewasset River |
| Mouth Location: | New Hampton |
| Mouth Coordinates: | 43.6831°N -71.6483°W |
| Mouth Elevation: | 450feet |
| Tributaries Left: | Ames Brook |
| Tributaries Right: | Owl Brook |
The Squam River is a 3.6adj=midNaNadj=mid[1] river located in central New Hampshire in the United States. The river is the outlet of Squam Lake, the second-largest lake in New Hampshire, and it is a tributary of the Pemigewasset River, which itself is a tributary of the Merrimack River.
The Squam River first appears as a narrow channel in Holderness, New Hampshire, between Squam Lake and Little Squam Lake downstream. The two lakes have the same elevation, due to a dam below the outlet to Little Squam, so the river in Holderness village is not free-flowing. Below Little Squam Lake the river proceeds south for over a mile before reaching the dam which controls the two lakes' water level. Below this point, the river quickly reaches the backwater from a mill dam in the town of Ashland.
In Ashland, the river drops in 0.2miles, sufficient to provide hydropower for numerous industries when the town originally grew in the 19th century. Below the center of town, the river wanders southeast under railroad tracks and Interstate 93 and past the Ashland sewage treatment plant before entering the Pemigewasset River in the northwest corner of the town of New Hampton.