Arcadian
Arcadian may refer to:
- Arcadian, someone or something from, or related to: 
- Arcadia (region), the ancient Greek region
 - Arcadia (regional unit), the region in modern Greece
 - Accademia degli Arcadi, the Italian literary academy founded in Rome
 - any of the other places known as "Arcadia"
 
 - Arcadian Greek, the dialect spoken in ancient Arcadia
 - Arcadian ecology, an environmentalist perspective
 - Bebearia arcadius, a butterfly in the family Nymphalidae
 
Arts and entertainment
- Arcadian (Star Trek), a race in Star Trek
 - The Arcadian, a 2011 American science fiction film
 - Arcadian (film), a 2024 American post-apocalyptic horror film starring Nicolas Cage
 - Arcadian (band), a Franco-Swiss band
 
Ships
- SS Arcadian, formerly the 1899 ship, SS Ortona, she was torpedoed and sunk in 1917
 - RMSP Asturias (1907), renamed RMSP Arcadian in 1923 and scrapped in 1933
 - HMS Arcadian, a projected Amphion-class submarine, the order for which was cancelled in 1945