Ethan Locken
- Full name: Ethan Locken
- Born: c.2335 (S31 Novel: Abyss)
- In "late thirties or early forties" as of April 2376
- Species: Human
- Gender: Male
- Illegally genetically engineered as a child (S31 Novel: Abyss)
- By 2373: Pediatrician, New Beijing (S31 Novel: Abyss)
- Begins association with Section 31 (S31 Novel: Abyss)
- Early February 2376: Departure for Sindorin mission (S31 Novel: Abyss)
- Intended to test waters for abandoned Jem'Hadar hatchery for repurposing under Federation control (S31 Novel: Abyss)
- Regular contact ceased by mid-March (S31 Novel: Abyss)