Phanias may refer to:
- A historic person:
- Phanias of Eresus in Lesbos, Greek philosopher
- Phanias (Stoic philosopher), a Stoic philosopher, disciple of Posidonius
- Phanias (Athenian Commander), an Athenian naval commander during the Corinthian War
- Phanias (spider), a genus of jumping spiders