For other uses of the name Leonard, see Leonard (disambiguation).

Leonard was a holographic Iguana created by Doctor Lewis Zimmerman in the mid-2370s and kept as a pet onboard the Jupiter Station. He had the distinct ability to speak, but only repeat what he heard, and in a slow deep voice.

Zimmerman claimed that Leonard was watching his weight, and that Haley should feed the salad to Leonard instead of making Zimmerman eat it.

In 2376, when The Doctor came aboard, he was annoyed by the numerous animals he'd come across, and deactivated Leonard. (VOY: "Life Line")