For the astronaut of the same name, please see O'Herlihy (astronaut).

Ensign O'Herlihy was a male Human Starfleet officer who lived during the mid-23rd century. He served in the operations division aboard the USS Enterprise under Captain James T. Kirk, during his historic five-year mission, where, in 2267, he served as one of the ship's ordnance officers.

That year, O'Herlihy was one of three tactical aides who beamed to an Earth observation outpost on Cestus III. Arriving, they discovered the colony had been destroyed by the Gorn, a previously unknown species. O'Herlihy was ordered by Captain Kirk to stay with him. Seconds after discovering the position of the attackers, however, O'Herlihy was killed by disruptor fire. (TOS: "Arena")

O'Herlihy was portrayed by Jerry Ayres, who went on to portray another redshirt casualty, Ensign Rizzo, in "Obsession".
The script of "Arena" gave O'Herlihy's shipboard position as "ordnance officer".

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