New Hampshire Route 12 is a 62.773-mile (101.023 km) long north–south state highway in southwestern New Hampshire. Its southern terminus is at the Massachusetts state line in Fitzwilliam, where it continues south as Massachusetts Route 12. Its northern terminus is at the Vermont state line in Claremont, where it continues north as Vermont Route 12. Most of the northern part of NH 12 runs along the Connecticut River.

New Hampshire Route 103 is a 48.300-mile-long (77.731 km) east–west highway in west-central New Hampshire, United States. The highway runs from Claremont, at the Vermont border on the Connecticut River, to Hopkinton, west of Concord.