The transportation system in Greenland is very unusual in that Greenland has no railways, no inland waterways, and virtually no roads between towns. Historically the major means of transportation has been by boat around the coast in summer and by dog sled in winter, particularly in the north and east. Nowadays air travel, by helicopter or other aircraft, is the main way of travel.

Two foot and 600 mm gauge railways are narrow gauge railways with track gauges of 2 ft and 600 mm, respectively. Railways with similar, less common track gauges, such as 1 ft 11+3⁄4 in and 1 ft 11+1⁄2 in, are grouped with 2 ft and 600 mm gauge railways.