Cetus may refer to:

• Cetus (constellation), a constellation straddling the celestial equator
• Cetus (mythology), the monster sent to devour Andromeda which was slain by Perseus
• The former biotechnology company Cetus Corporation
• Project Cetus, crewless submarine being developed by the United Kingdom
• "-cetus", a suffix used to describe whales in taxonomy.
• Cetus, a settlement on Earth in the online game Warframe that hosts the Ostrons, a civilization of human traders
• USS Cetus, a Crater-class cargo ship in the United States Navy in World War II

This disambiguation page lists articles associated with the title Cetus.
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