Clancy or Clancey could refer to:
- People
- Clancy (Admiral), a 24th century admiral
- Clancy (Crewperson), a 23rd century member of the crew of Ransom Castle
- Clancy (Ensign), a female security officer aboard the USS Enterprise
- Clancy (soldier), a Union Army soldier in the American Civil War
- Billy Clancey, a 19th century criminal
- Esmeralda Clancy, an ensign aboard the USS Enterprise-D
- Jacob Clancy, a 23rd century resident of Tarsus IV
- Kirsten Clancy, a commander-in-chief of Starfleet Command
- Roland Francis Clancey, a 19th century captain
- "Real" people
- Lisa Clancy, editor of Starfleet Academy DS9 young adult novels
- Tom Clancy, a 20th century novelist
- Ships
- USS Clancy, a 23rd century Miranda-class starship
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