New Hampshire Route 135

New Hampshire Route 135 (abbreviated NH 135) is a 46.677 mi north–south state highway in New Hampshire. The highway runs along the Connecticut River from Woodsville in the town of Haverhill to Lancaster.

The southern terminus of NH 135 is at New Hampshire Route 10 in Woodsville. The northern terminus is at U.S. Route 2 and U.S. Route 3 in Lancaster.