The Regia was a structure in the Forum of Ancient Rome, originally the residence of the Kings. Regia may also refer to:
- Latin
- Aqua regia, mixture of concentrated nitric acid and concentrated hydrochloric acid
- Regia Anglorum, British medieval reenactment organisation
- Bulla Regia, former Roman city near modern Jendouba, Tunisia
- Editio Regia, third and the most important edition of the Greek New Testament of Robert Estienne
- Via Regia, "King's Highway"
- "Vivas Schola Regia", song of the Royal High School of Edinburgh.
- Regia, a classical type of building.
- Italian
- Spanish
- Fuerza Regia, Mexican professional basketball team based in Monterrey