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.