Tarbell Brook is a 10.1-mile-long (16.3 km) stream located in southwestern New Hampshire and northern Massachusetts in the United States. It is a tributary of the Millers River, itself a tributary of the Connecticut River, which flows to Long Island Sound.
Tarbell Brook rises in the northeast corner of the town of Fitzwilliam, New Hampshire, and southeast into Rindge, where it receives the outflow of Pearly Lake and continues south to the Damon Reservoirs. The brook then passes into Winchendon, Massachusetts, reaching the Millers River approximately two miles west of the town center.
It bears the name of Lieutenant Samuel Tarbell (1744-1828), a Revolutionary War Minuteman soldier who settled in Rindge with his wife Beatrice Carter in 1773, soon thereafter building a water powered mill at the outflow of Pearly Lake (formerly known as Tarbell Pond). Although the mill is long gone, Tarbell's Cape Cod style house nearby still presides over Route 119.