Leonard could refer to:
- People
- Leonard, a holographic iguana pet at Jupiter Station
- Leonard James Akaar, a 24th century Starfleet admiral
- Leonardo da Vinci, a noted painter and inventor
- Leonard Forest, a.k.a "Lightning Len", a 23rd century assassin
- Leonard Llewellyn, a 23rd century Federation attorney and Spacelanes contributor
- Leonard McCoy, CMO of the USS Enterprise
- Leonard Nimoy, the actor who first portrayed Spock
- Leonard Scott, an alias used by James T. Kirk
- Daniel Leonard, a senior officer in Earth Starfleet
- Fictional characters
- Leonard Cantrell, a vintner in the Dixon Hill holonovel The Rich and the Dead
- Real-world topics
- Leonard A. Emery, a Ships of the Line artist
- Leonard McCoy, Frontier Doctor, an IDW miniseries
- Leonard O'Grady, an IDW Publishing artist
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