ALU, alu or Alu may refer to:
- Academy of Fine Arts and Design, Ljubljana
- Assisted Living Unit, care residency that usually includes the regular provision of a range of personal services
- Alcatel-Lucent, a company traded on the NYSE
- Arithmetic logic unit, a digital circuit that performs arithmetic and logical operations
- Army Logistics University, a subordinate school of the US Army Combined Arms Support Command at Fort Lee, Virginia, USA
- Alû, the Mesopotamian demon of night
- Alu (musician), Los Angeles based musician
- Alu (runic), in Germanic paganism
- Alu sequence, a common short repeated stretch of DNA originally characterized by the action of the Alu restriction endonuclease
- ALU (American Laborers United), Free Online Information Resource Center and Referral Network, offering Union Discounts
- Places
- Alu, Ardabil, Iran
- Alu, Estonia, small borough in Rapla Parish, Rapla County, Estonia
- Alu, Pärnu County, village in Tõstamaa Parish, Pärnu County, Estonia
- Science
- Alu element, a short stretch of DNA occurring in primate genomes
- Andrea Alù a scientist
- Volcanoes
- Alu (Ethiopia)
- Alu, Sulu, Philippines