The canton of Appenzell Ausserrhoden (German: [ˈapənˌtsɛl ˈaʊ̯sərˌroːdən]; in English sometimes Appenzell Outer Rhodes) is a canton of Switzerland. The seat of the government and parliament is Herisau, judicial authorities are in Trogen. Appenzell Ausserrhoden is located in the north east of Switzerland, bordering the cantons of St. Gallen and Appenzell Innerrhoden.

Settlement in Appenzell started in the 7th and the 8th century alongside the river Glatt. The monastery of St. Gallen was of great influence on the local population. In 907 Herisau is mentioned for the first time, the canton (Appenzell: abbatis cella) is named first in 1071.

The name Appenzell (Latin: abbatis cella) means "cell (i.e. estate) of the abbot". This refers to the Abbey of St. Gall, which exerted a great influence on the area. By the middle of the 11th century the abbots of St Gall had established their power in the land later called Appenzell, which, too, became thoroughly teutonized, its early inhabitants having probably been romanized Raetians.

By about 1360, conflicts over grazing rights, taxes, and tithes were causing concern for both the abbot and the farmers of Appenzell. Both parties wanted to protect their rights and interests by joining the new Swabian League. In 1377 Appenzell was allowed to join the League with the support of the cities of Konstanz and St. Gallen (the city of St. Gallen was often at odds with the neighboring Abbey of St. Gall). With the support of League, Appenzell refused to pay many of the gifts and tithes that the Abbot Kuno von Stoffeln demanded. In response to the loss of revenue from his estates, Kuno approached the Austrian House of Habsburg for help. In 1392 he made an agreement with the Habsburgs, which was renewed in 1402. In response, in 1401 Appenzell entered into an alliance with the city of St. Gallen to protect their rights and freedom.

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