| South Branch Israel 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: | County |
| Subdivision Name3: | Coos |
| Subdivision Type4: | Townships |
| Subdivision Name4: | Thompson & Meserves Purchase, Low & Burbanks Grant, Jefferson |
| Length: | 6.8miles |
| Source1: | Mount Jefferson |
| Source1 Location: | Thompson & Meserves Purchase |
| Source1 Coordinates: | 44.3017°N -71.3381°W |
| Source1 Elevation: | 1038m (3,406feet) |
| Mouth: | Israel River |
| Mouth Location: | Jefferson |
| Mouth Coordinates: | 44.3597°N -71.3936°W |
| Mouth Elevation: | 411m (1,348feet) |
| Tributaries Right: | Little Bear Brook |
The South Branch of the Israel River is a 6.8adj=midNaNadj=mid[1] river in the White Mountains of New Hampshire in the United States. It is a tributary of the Israel River and part of the Connecticut River watershed. For most of its length, it is within the White Mountain National Forest.
The South Branch rises on the western slopes of Mount Jefferson in the Presidential Range of the White Mountains. It flows west, between the Ridge of the Caps to the south and Castellated Ridge to the north, then turns northwest when it reaches the Jefferson Notch Road. The river parallels the notch road and enters the town of Jefferson, where it joins the Israel River.