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=== D ===E
* '''Dammar''' (VOY, "Displaced") The first Nyrian pretending to have been posited on ''Voyager'' without his consent.
* '''Gul Darhe'el''' called "The Butcher of Gallitep" for his role in the Cardassian occupation of Bajor
* '''Dathon''' (TNG, "Darmok")
* '''Carmen Davila''' Colonizer who died in a Chrystalline Entity attack
* '''[[Dax (Star Trek)|Dax symbiont]]''' [[Trill (Star Trek)|Trill]] worm, over 300 years old
* '''Audrid Dax''' Fourth host of Dax symbiont
* '''[[Curzon Dax]]''' Host of Dax symbiont before Jadzia
* '''Emony Dax''' Third host of Dax symbiont
* '''[[Ezri Dax]]''' Host of Dax symbiont after Jadzia
* '''[[Jadzia Dax]]''' Host of Dax symbiont after Curzon
* '''Joran Dax''' Sixth host of Dax symbiont
* '''Lela Dax''' First host of Dax symbiont
* '''Tobin Dax''' Second host of Dax symbiont
* '''Torias Dax''' Fifth host of Dax symbiont
* '''Yedrin Dax''' (DS9, "Children of Time") Descendant of [[Jadzia Dax]] and host of the [[Dax (Star Trek)|Dax]] symbiont in an alternate timeline
* '''Richard Daystrom''' (TOS, "The Ultimate Computer"), creator of [[M5 (Star Trek)|M5]] multitronic computer system.
* '''[[Willard Decker]]''' (ST:TMP), Captain of the ''Enterprise'' NCC-1701 before leaving to become [[V'ger]]'s human representative.
* '''[[Degra]]''' (ENT, third season), [[Xindi]] scientist who supervised construction of the Xindi weapon.
* '''DeSeve''' (TNG, "Face of the Enemy") Starfleet officer who defected to Romulus.
* '''Klim Dokachin''' (TNG, "Unification II"), Zakdorn quartermaster and administrator of the Federation Surplus Depot Z15.
* '''[[Dolim]]''' Also known as [[Guruk]], military officer who [[hijack]]ed the Xindi weapon (ENT, third season)
* '''Jenna D'Sora''' (TNG, "In Theory"), crewwoman who fell in love with Data.
* '''Duchamps''' (DS9, "Our Man Bashir") An assistant to Dr. Noah in Bashir's secret agent program. Due to a transporter malfunction, Duchamps's physical parameters were temporarily modelled on Worf.
* '''[[Duras]]''', notably aggressive and dishonest dynasty of the [[Klingon]] empire.
=== E ===
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