Cajus may refer to:
- Caius of Korea (1571–1624), Roman Catholic martyr
- Cajus Schmiedtlein (c. 1555–1611), German composer and organist
- Theretra cajus, a moth of family Sphingidae
- The Latin praenomen Gaius, also spelled Cajus
This disambiguation page lists articles associated with the title Cajus.
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