New Hampshire Route 84 is a 4.184-mile-long (6.733 km) secondary east–west state highway in Rockingham County in southeastern New Hampshire.

The western terminus is in Kensington at New Hampshire Route 150.

The eastern terminus of NH 84 is in Hampton Falls at U.S. Route 1.

After less than a mile, it crosses into Hampton Falls, heading eastward towards downtown.

This New Hampshire road-related article is a stub.