| Otter Brook | |
| 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: | Cheshire |
| Subdivision Type4: | Towns and city |
| Subdivision Name4: | Stoddard, Nelson, Sullivan, Roxbury, Keene |
| Length: | 13.2miles |
| Source1: | Chandler Meadow |
| Source1 Location: | Stoddard |
| Source1 Coordinates: | 43.0567°N -72.1325°W |
| Source1 Elevation: | 389order=flipNaNorder=flip |
| Mouth: | The Branch |
| Mouth Location: | Keene |
| Mouth Coordinates: | 42.9147°N -72.2378°W |
| Mouth Elevation: | 170order=flipNaNorder=flip |
| Tributaries Left: | Wheeler Brook, Roaring Brook |
| Tributaries Right: | Robinson Brook, Davis Brook, Bolster Brook, Spaulding Brook, Hubbard Brook, Ferry Brook |
Otter Brook is a 13.2adj=midNaNadj=mid[1] river located in southwestern New Hampshire in the United States. It is a tributary of The Branch of the Ashuelot River, itself a tributary of the Connecticut River, which flows to Long Island Sound.
Otter Brook begins at Chandler Meadow, in the town of Stoddard, New Hampshire. It flows southwest through the towns of Nelson, Sullivan, and Roxbury, eventually entering the city of Keene, where it joins Minnewawa Brook to form The Branch.
The brook passes through Ellis Reservoir (a small lake in Sullivan) and Otter Brook Lake, a flood control reservoir built on the boundary between Keene and Roxbury. The dam which created Otter Brook lake was completed in 1958.[2] From the village of East Sullivan to Otter Brook Lake, the brook is followed by New Hampshire Route 9.