Realp (archaic Urnerdeutsch: Frialp) is a municipality in the Canton of Uri in Switzerland .

Realp is first mentioned in 1363 as Riealb.

Realp has an area, as of 2006, of 78 km2 (30 sq mi). Of this area, 41.6% is used for agricultural purposes, while 2.3% is forested. Of the rest of the land, 0.6% is settled (buildings or roads) and the remainder (55.4%) is non-productive (rivers, glaciers or mountains). In the 1993/94 land survey, 0.2% of the total land area was heavily forested, while 2.1% is covered in small trees and shrubbery.