Leu may refer to:
Businesses and organisations
- LEU, NYSE American stock symbol for Centrus Energy Corp.
- London Ecology Unit, a former body (1986–2000) which advised London boroughs on environmental matters
- Free and Equal (LeU – Liberi e Uguali), a political alliance in Italy
Heraldry
- Leu, archaic term for Wolves in heraldry
Money
- Moldovan leu, monetary unit of Moldova
- Romanian leu, monetary unit of Romania
Places
- LEU, IATA code for Andorra–La Seu d'Urgell Airport in Spain
- Leu, Dolj, a commune in Dolj County, Romania
Science and technology
- Low-enriched uranium, uranium that is enriched but to less than 20% U-235
- Leu (or L), abbreviation for leucine, an amino acid
- Lineside Electronics Unit, a component of the European Train Control System
People with the surname
- August Leu (1818–1897), German painter
- Mihai Leu (1968–2025), Romanian professional boxer
- Véronique Leu-Govind, Mauritian politician