Leonov could refer to:
- People
- Alexey Leonov, a 20th century cosmonaut
- Starships
- USS Leonov (23rd century), a mid-23rd century Miranda-class starship
- USS Leonov (24th century), a mid-24th century Miranda-class starship
- USS Alexey Leonov, a late-24th century Defiant-class starship
- Locations
- Starbase Leonov, a 24th century Federation starbase
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