Terry Ahern was a Starfleet officer in the 24th century.
In 2370, he was listed as a Research and Development officer on the dedication plaque of the USS Defiant on stardate 47538.5. (DS9: "The Die is Cast", dedication plaque)
In 2375, Ahern was credited on a plaque as part of the R&D crew of newly constructed USS Sao Paulo. (DS9: "The Dogs of War" set artwork)
Ahern, who was listed on various pieces of background artwork, was named for craft service associate Terry Ahern.