Agia, Ayia, Aghia, & Hagia may refer to:
- Greek word
- Agia/Ayia/Aghia/Hagia (Αγία), the Greek word for "saint" (feminine form), like Agia Varvara
- Agia, Cyprus, town in Nicosia District, Cyprus
- Agia, Chania, a town in Chania (regional unit), Crete, Greece
- Agia, Larissa, a town in Larissa regional unit, Greece
- Hagia triada, an archaeological site in southern Crete
- All pages beginning with "Agia"
- All pages beginning with "Ayia"
- All pages beginning with "Aghia"
- All pages beginning with "Hagia"
- Other
- Alaska Gas Inducement Act, a natural gas pipeline act in Alaska
- Agia (moth)