Ensign Kaplan was a member of the USS Voyager's crew while the ship was in the Delta Quadrant.

In 2374, she was referred to in conversation between Harry Kim and an imposter posing as Tom Paris. She was to be their opponent in a holodeck golf rematch. Kim couldn't wait for the rematch, as he felt she "won't know what hit her" this time. (VOY: "Vis à Vis")

This character was only mentioned in dialogue.
There were two ensigns named Kaplan on Voyager, Ensign Marie Kaplan having died in 2373.