The Tramway of Quend-Plage and Fort-Mahon (French: le tramway de Quend-Plage et Fort-Mahon or le tramway du Marquenterre) was a 12.8 km (8.0 mi) long 600 mm (1 ft 11+5⁄8 in) gauge railway line, which operated from 1898-1914 and 1921-1934.

The Société Immobilière de Saint-Quentin-Plage built the 8 km (5.0 mi) long narrow-gauge tramway from the station Quend-Fort-Mahon to the beach at Quend-Plage (previously known as Saint-Quentin-Plage).[Rem.

In 1903, a 4.8 km (3.0 mi) long branch line was built to the beach at Fort-Mahon-Plage.

[2] In 1914, the portable pieces of track with a rail weight of 9.5 to 15 kg/m (19 to 30 lb/yd) were lifted to be used during World War I and re-laid in 1919.

[2] Initially, two open Decauville summer cars, one Decauville saloon car and three V-skip trucks were used.