Decius may refer to:
- People:
- Decius, a Romulan military officer.
- Decius (Kelvin timeline), alternate reality Romulan military officer.
- Starships:
- ChR Decius, a Romulan warship.
- IRW Decius, a Romulan D'deridex-class warbird.
- IRW Decius, a Romulan Scimitar-class warbird.
- Decius (Centurion class), a Romulan Centurion-class flagship.
- Decius (Cetratus class), a Romulan Cetratus-class bomber.
- Decius (Gladius class), a Romulan Gladius-class fighter.
- Decius (Patronus class), a Romulan Patronus-class support frigate.
- Decius (Securis class), a Romulan Securis-class missile cruiser.
- Decius, a Romulan cruiser.
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