Alsos may refer to:
- Alsos Forest, a natural park in Nicosia, Cyprus
- Operation Alsos, an effort by the Allies during World War II
- Russian Alsos
- Alsos, Achaea, a village in the municipality of Sympoliteia in Achaea, Greece
- Alsos Nea Smyrni
- Alsos Veikou, a public park in Galatsi, in northern Athens, Greece
- Alsos Digital Library for Nuclear Issues