New Hampshire Route 101D

New Hampshire Route 111
Map of southern New Hampshire with NH 111 highlighted in red
Route information
Maintained by NHDOT
Length:	50.027 mi (80.511 km)
Major junctions
West end:	Route 111 in Pepperell, MA
	Everett Turnpike / US 3 in Nashua I‑93 in Windham NH 107 / NH 125 in Kingston
East end:	NH 1A in North Hampton
Location
Counties:	Hillsborough, Rockingham
Highway system
New Hampshire Highway System Interstate U.S. State Turnpikes ← NH 110B NH 112 → ← NH 101C NH 101E →

New Hampshire Route 111 (abbreviated NH 111) is a 50.027-mile-long (80.511 km) east–west highway in Hillsborough and Rockingham counties in southeastern New Hampshire. The road runs from the Massachusetts border at Hollis to North Hampton on the Atlantic shore.

The western terminus of NH 111 is at the Massachusetts state line in Hollis, where, as Massachusetts Route 111 (Nashua Road), the road continues into the town of Pepperell, Massachusetts. The eastern terminus of NH 111 is at the junction with Ocean Boulevard (New Hampshire Route 1A) in North Hampton. At its terminus, the road is known as Atlantic Avenue.

The portion of NH 111 between New Hampshire Route 27 in Hampton and NH 1A in Hampton Beach was once designated New Hampshire Route 101D.

New Hampshire Route 111A is a designation held by three separate state highways in New Hampshire. Although none of the segments directly connect, all three roadways are linked by their parent, New Hampshire Route 111.