Canton of Obwalden or Obwald (German: Kanton Obwalden [ˈɔbˌvaldn̩] ; Romansh: Chantun Sursilvania; French: Canton d'Obwald; Italian: Canton Obvaldo) is one of the 26 cantons forming the Swiss Confederation. It is composed of seven municipalities and the seat of the government and parliament is in Sarnen. It is traditionally considered a "half-canton", the other half being Nidwalden.

Obwalden lies in Central Switzerland and contains the geographical centre of Switzerland. It is bordered by the Canton of Lucerne to the north, the canton of Nidwalden and Uri to the east and the Canton of Bern to the south. The canton is essentially in the valley of the Sarner Aa south of Lake Lucerne, with an exclave around Engelberg.