Belus or Belos may be:
- The classical Latin or Greek rendition of Bel (god) the Semitic honorific
- Ba`al as a Semitic deity
- Belus (Babylonian), the Greek Zeus Belos and Latin Jupiter Belus as translations of the Babylonian god Bel Marduk
- Belus (Assyrian): a purported king of Assyria in Greek historiography
- Belus (Egyptian) (sometimes called Belus I), a king of Egypt in Greek mythology
- Belus II, father of Dido in Greek mythology
- Belus (Lydian). See Omphale. He was a grandson of Heracles and ancestor of the Heraclid dynasty in Lydia according to Herodotus.
- Beloš Vukanović or Beluš, Regent of Hungary 1141-1146, Ban of Croatia 1142-1158, Grand Prince of Serbia 1162
- toponymy
- Belus River, a river in Israel
- Bélus, a town in the Landes department of France
- taxonomy
- Belus (genus), a genus of primitive weevils
- other
- Belus (album), a Burzum album
- HMS Belos (A214), a submarine rescue ship in the Swedish Navy