Castelsardo (long toktok Itali; toktok Sadinia: Casteddu Sardu, toktok Sassari: Caltheddu Saldhu), hem i wan smolfala taon long not blong aelan Sadinia, we hemi aelan blong Itali.

Long Castelsardo long yia 2007

Long yia 2019, hemi bin gat 5,904 pipol. Castelsardo i stap popiula taon blong turis.