Mount Sunapee (or Sunapee Mountain on federal maps) is a 5-mile-long (8.0 km) mountain ridge in the towns of Newbury and Goshen in western New Hampshire, United States. Its highest peak, at the north end of the mountain, is 2,726 feet (831 m) above sea level. The mountain has three secondary peaks, White Ledges at 2,716 ft (828 m); North Peak at 2,280 ft (695 m); and South Peak at 2,608 ft (795 m). The north end of the mountain, including the summit, is within Mount Sunapee State Park, which encompasses 3.85 square miles (10.0 km2) and is home to the popular Mount Sunapee Resort. The mountain extends south to Pillsbury State Park in the towns of Goshen and Washington.

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The entire mountain ridge is traversed by the Monadnock-Sunapee Greenway, a hiking trail that links the summit of Sunapee with that of Mount Monadnock, 50 miles (80 km) to the south in the town of Jaffrey, New Hampshire. Also crossing the summit in an east-west route is a section of the Sunapee-Ragged-Kearsarge Greenway, a 75-mile (121 km) trail linking ten towns in west-central New Hampshire as it circles the Lake Sunapee region and crosses the summits of the three mountains for which it is named. The two Greenway trails meet at Lake Solitude and use the same trail to the summit.

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Snow skiing and snowboard riding are popular winter activities at Mount Sunapee Resort & Ski Area. The ski area lies within Mount Sunapee State Park, but in 1998 the state leased the 968-acre (392 ha) ski area of the park to be operated by Tim and Dianne Mueller, who own Okemo Mountain Resort. New lifts were added in 1998.

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The state park's extensive trail system is used in all seasons for hiking and in winter for snowshoeing. The park is linked to Pillsbury State Park and southern New Hampshire by the 50-mile (80 km) Monadnock-Sunapee Greenway and to the ten-town Lake Sunapee region by the 75-mile (121 km) "emerald necklace" of the Sunapee-Ragged-Kearsarge (SRK) Greenway which connects Mt. Sunapee to Wadleigh State Park in Sutton and to Winslow and Rollins State Parks on Mount Kearsarge in Warnerand Wilmot. From the ski area parking, the Summit Trail travels 2 miles (3 km) along the western slope to the summit, where it meets the Solitude Trail for a 1 mile (1.6 km) walk to Lake Solitude and White Ledges. The Solitude Trail then links to several trails, notably the popular Andrew Brook Trail and the steeper Newbury Trail, both heading eastward, and to the M-S Greenway as it heads south along Sunapee Mountain toward Pillsbury State Park.