Canton of Appenzell Innerrhoden (German: Kanton Appenzell Innerrhoden [ˈapn̩tsɛl ˈɪnərˌroːdn̩] ; Romansh: Chantun Appenzell Dadens; French: Canton d'Appenzell Rhodes-Intérieures; Italian: Canton Appenzello Interno), in English sometimes Appenzell Inner-Rhodes, is one of the 26 cantons forming the Swiss Confederation. It is composed of five districts. The seat of the government and parliament is Appenzell. It is traditionally considered a "half-canton", the other half being Appenzell Ausserrhoden.
Appenzell Innerrhoden is the smallest canton of Switzerland by population and the second smallest by area. It is located in the northeast of the country. Together with the canton of Appenzell Ausserrhoden, it forms an enclave within the canton of St. Gallen. The canton is essentially located in the Alpine foothills of the Alpstein massif, culminating at the Säntis.