New Hampshire Route 113 (abbreviated NH 113) is a 40.42-mile-long (65.05 km) east–west state highway in east-central New Hampshire. Route 113 begins in the Lakes Region at an intersection with U.S. Route 3 and New Hampshire Route 25 in Holderness, and stretches eastward across the central part of the state, ending at an intersection with U.S. Route 302 in Conway, just a few miles west of the Maine border.

NH 113 is signed as an east-west route, but is oriented in a southwest-northeast fashion. It begins in Holderness, splitting off the Daniel Webster Highway (US 3/NH 25) near Squam Lake. While the D.W. Highway skirts the southern side of the lake, NH 113 heads around the west and north sides of the lake and east into the town of Sandwich, where it meets the northern end of NH 109. Continuing northeast, NH 113A splits off to the north before NH 113 turns east to enter Tamworth, where it joins NH 25 for a short concurrency. NH 113 turns back northeast, intersecting the eastern end of the NH 113A loop before crossing the White Mountain Highway (NH 16) near Chocorua Lake. NH 113 continues eastward into Madison, meeting the northern end of NH 41, and then turns almost due north towards Conway. After entering Conway, NH 113 once again intersects NH 16, this time forming a concurrency running through Conway Village. Along the way the two routes meet the eastern end of the Kancamagus Highway (NH 112). In downtown Conway, NH 113 splits eastward from NH 16 just after intersecting the northern end of NH 153. While NH 16 continues northward towards North Conway, NH 113 heads east towards Center Conway as East Main Street. After about 1.5 miles (2.4 km), it comes to what is now its eastern terminus at US 302. However, NH 113 continues to be signed along US 302 eastbound as it continues towards the state border at Fryeburg, Maine.

NH 113's historic terminus was at the state line, joining US-302 in Conway, continuing a few miles eastward and abruptly ending at the border, and the road continued east as standalone US-302. This also meant that, upon US-302 crossing westbound into New Hampshire, Route 113 simply showed up on signs with US-302. Aside from this concurrency being completely unnecessary, the signage also proves potentially confusing, as US-302 intersects Maine State Route 113 just a few miles east of the border. Maine's Route 113, despite the fact that it does cross into New Hampshire twice, is unrelated to New Hampshire's Route 113.

The state has since truncated Route 113 to end at the intersection with US-302 in Conway, officially eliminating the concurrency. However, as of August 2011, signage had not been updated to reflect this change.

New Hampshire Route 113A is a 13.19-mile-long (21.23 km) loop road in Carroll County, New Hampshire. The highway splits from New Hampshire Route 113 in Tamworth, loops around to the north, west and south, then rejoins NH 113 again in the town of Sandwich. The road provides access to Hemenway State Forest in the White Mountains area of New Hampshire.

The eastern terminus of NH 113A is in Tamworth at NH 113. In this area, the highway is named Chinook Trail. The western terminus is at NH 113 in Sandwich, where the road is named Whiteface Road.

Along the route NH 113A passes through the village of Wonalancet in Tamworth and Whiteface and North Sandwich in Sandwich.

New Hampshire Route 113B, despite its designation, is not a loop road of New Hampshire's Route 113. The route, which never intersects nor comes close to NH 113, is a loop of Maine State Route 113, but lies almost entirely within New Hampshire, producing the very unusual situation of one state having a suffixed route off another state's highway.