Cocceius is the nomen of the Roman gens Cocceia, and may refer to members of that family, particularly:
- Cocceius Auctus, a Roman architect.
Cocceius may also refer to:
- Johannes Cocceius, a 17th century Dutch theologian.
Coccejus is an alternate spelling of the name, used after the widespread adoption of the letter "j" as a consonantal form of "i". This form of spelling was common in Latin names until the 19th Century.