Jenny Delaney was a Human Starfleet crewman. In 2371, she was assigned to USS Voyager's stellar cartography section when that starship was pulled into the Delta Quadrant by the Caretaker.

Shortly after Voyager arrived in the Delta Quadrant, Tom Paris attempted to persuade Harry Kim to have a date with Jenny, so he could pursue Megan, her twin sister. Kim turned him down despite Paris' continuous persuasion. (VOY: "Time and Again")

The two did later go out; however, the date proved disastrous, when Jenny's advances caused Harry to fall out of a gondola in the holodeck. (VOY: "Prime Factors")

By 2375, Jenny and Megan were good friends with Paris and Kim, joining them in Paris' The Adventures of Captain Proton program, where Jenny played Malicia, one of the Twin Mistresses of Evil. Jenny was still interested in Harry, but he had turned his affections towards Megan. (VOY: "Thirty Days")