Caius
- Cai (name)
- Caio (disambiguation)
- Caius (bishop of Milan)
- Caius (presbyter)
- Caius Brediceanu
- Caius Choirbook
- Caius Gabriel Cibber
- Caius Iacob
- Caius Largennius
- Caius Lungu
- Caius Novac
- Caius Welcker
- Caius of Korea
- Cameron Monaghan
- Cayo (disambiguation)
- Coriolanus
- Cymbeline
- Final Fantasy XIII-2
- Gaius
- Gonville and Caius College, Cambridge
- Jean Ferdinand Caius
- John Caius
- John Caius the Elder
- King Lear
- Latin language
- Pope Caius
- Sir John in Love
- Spartacus (film)
- Tales of the Tempest
- The Merry Wives of Windsor
- The Skystone
- The Titan's Bride
- Thomas Caius
- Twilight (novel series)