Tiu may refer to:
- Tiu (pharaoh) (4th millennium BC), predynastic Pharaoh of Lower Egypt
- Týr, as the Old English name for the Sky-God of Norse (Germanic) Mythology
- Tiu, the Babylonian fiend of headache
- Ţiu, a village in Cernăteşti Commune, Dolj County, Romania
a surname:
- Chris Tiu, a Filipino basketball player
- a variant of the Chinese family name Teoh
- The Filipino version of the Chinese surname Zhang
TIU may refer to: