Attu may refer to:
- Attu Island in Alaska, the westernmost island of the Aleutian Islands chain
- The Battle of Attu, the primary land battle in the Aleutian Islands campaign of World War II, which took place on Attu Island in May 1943.
- Attu Station, Alaska, a LORAN station on Attu Island
- Attu (Greenland), a settlement in western Greenland
- Attu (film), a 2017 Indian gangster film
- An extinct dialect of the Aleut language
- An island in Pargas, Väståboland, Finland
- A breakfast dish in Andhra Pradesh, India; see List of Indian dishes