Elizabeth Hannah Dennehy (born October 1, 1960) is an American television and film actress, best known for her role as Commander Shelby in the Star Trek: The Next Generation two-part episode "The Best of Both Worlds".
She has also appeared in such television series as Guiding Light, Seinfeld, Charmed, and Without a Trace, and films such as Clear and Present Danger, Gattaca, Soldier, Red Dragon, and True Blood.
In September 1994, when Geneviève Bujold quit Star Trek: Voyager after three days of filming, Dennehy was reported as one of the replacement candidates for the role of Captain Janeway.Dennehy is the daughter of actor Brian Dennehy.
In 2017, Den of Geek ranked Elizabeth Dennehy's role as Lt.
Commander Shelby, in Star Trek: The Next Generation famed "Best of Both Worlds, Part I" and "Best of Both World's, Part II" as one of the top ten guest star roles on Star Trek: The Next Generation.
They remark that Elizabeth Dennehy does a great job of holding her own with the rest of the cast and portraying a capable officer.