The Canton of Castagniccia (French: canton de la Castagniccia, [kɑ̃tɔ̃ də la kastaɲitʃ(j)a]) is a canton of the Haute-Corse department, Corsica, France, named after the natural region of Castagniccia (Corsican pronunciation: [kaˈstaɲɲitˈtʃa]). It was created at the French canton reorganisation which came into effect in March 2015. Its seat is in San-Nicolao.

It consists of the following communes: