Alcor can refer to:
- Alcor (star), also known as 80 Ursae Majoris, a star in Ursa Major very close to Mizar
- Alcor Life Extension Foundation
- Alcor sailplane, a high altitude pressurized sailplane developed by aeronautical engineer Robert Lamson
- ALCOR, a programming language
- French name of the anime and manga hero Kouji Kabuto