Douglas Roy Dack
- Mighty Man
Sandy Da Costa
- Alien
- Morphing Alien
John Dadey
- Local Agent
- Second US Marshall
Cory Dagg
- Bartender
Christopher Dahlberg
- State Trooper
Tom Dahlgren
- Dr Irving Thalbro
Patricia Dahlquist
- Susan Chambliss
Lesley Daine
- Barmaid
Alan Dale
- Michael Wilhelm
- Toothpick Man
Christina D'Alimonte
- Doctor's Colleague
Amy D'Allessandro
- Amy Sheridan Aufsbergher
Yvonne D'Alpra
- Mrs Waller
Wally Dalton
- Raymond Helm
Colm Daly
- Student
Jane Daly
- Mrs Holt [Principal]
Rob Daly
Marcus D'Amico
- Daniel
Charles Dance
- Parker
Jacqueline Dandeneau
- Nurse Castor
Paul Daneman
- Dawson
Suzanne Danielle
- Pretty Girl
Andre Daniels
- Arlan Green
- Harry McNally
Demord Dann
- Team Medic
Blythe Danner
- Assistant Director Jana Cassidy
Harry Danner
- CDC Doctor
Andre Danyliu
- County Coroner
Rob Daprocida
- Bunny
Kim Darby
- Kathy Lee Tencate
Rhys Darby
Maureen Darbyshire
- CI5 Girl
Jan D'Arcy
- Judge Kann
Lisa Darr
- Attorney Jana Fain
Gora Dasgupta
- Boy
Garry Davey
- Hunter
- Dr Keats
- Captain
- Bob Spitz
J David
- Young Boss
Jonathan David
- Raider
Alan Davidson
- Bearded Man
Peter Davidson
- Lorry Driver
Glynis Davies
- Defence Counsel Nelson
- Ellen Brumfield
- Monica Landis
Jackson Davies
- Agent Bruskin
Janet Davies
- Roz Hatch
Meg Davies
- Sheila Kaufmann
Mitchell Davies
- Stealth Soldier
Rachel Davies
- Deborah
Rowland Davies
- Doctor
- Male Secretary
Stacy Davies
- Sammy
Virgil Davies
Alexander Davion
- Torres
Craig Davis
- First Primitive
Don Davis
- Captain William Scully
Eleanor Davis
- Julie
Pamela Kay Davis
- Second Reporter
Philip Davis
- Billy Turner
William B Davis
- Writer
- Smoking Man
- 1X79 The X-Files
- 1X15 Young at Heart
- 1X20 Tooms
- 1X23 The Erlenmeyer Flask
- 2X01 Little Green Men
- 2X04 Sleepless
- 2X06 Ascension
- 2X08 One Breath
- 2X22 F Emasculata
- 2X25 The Anasazi
- 3X01 The Blessing Way
- 3X02 Paper Clip
- 3X10 731
- 3X16 Apocrypha
- 3X21 Avatar
- 3X23 Wetwired
- 3X24 Talitha Cumi
- 4X01 Herrenvolk
- 4X07 Musings of a Cigarette Smoking Man
- 4X09 Tunguska
- 4X10 Terma
- 4X15 Memento Mori
- 4X21 Zero Sum
- 5X02 Redux
- 5X03 Redux II
- 5X14 The Red and the Black
- 5X20 The End
- The X-Files: Fight the Future
- 6ABX01 The Beginning
- 6ABX03 Triangle
- 6ABX11 Two Fathers
- 6ABX12 One Son
- 6ABX22 Biogenesis
- 7ABX04 The Sixth Extinction II: Amor Fati
- 7ABX11 Closure
- 7ABX15 En Ami
- 7ABX22 Requiem
- 9ABX19 / 9ABX20 The Truth
- 1AYW01 My Struggle
- 1AYW04 Babylon
- 1AYW06 My Struggle II
Paul Dawkins
- Tramp
Bob Dawson
- Phil Rich
Ernest Day
- Director
Felicity Dean
Jo-Ann Dean
- Secretary
Rick Deats
- Man on Doughnut Bicycle
- Dr James Scobie
Lee de Broux
- Edward Van Blundht Sr
Ryan DeBoer
- Young William Scully Jr
Alfred De Contreras
- Bartender
Taunya Dee
- Ruby Morris
Steven De Jarnatt
- Writer
David De Keyser
- Otto Hahn
Aimee Delamain
- Old Lady
Nick de Marinis
- Pizza Man
Claude de Martino
- Dr Grissom
Grace Demontesquiou
- Baby
Kelly Demontesquiou
- Baby
Michael Dempsey
- Sheriff
Jeffrey DeMunn
- Dr Ben Bronschweig
Maurice Denham
- Sir James Temple
Neil Denis
- Catcher
Michael Denison
- Lord Derrington
Tony Denison
- Agent Larry Rose
David Denman
- Wallace Schiff
Catherine Dent
- Carol Strode
- June Gurwitch
Edward Dentith
- High Ranking Police Officer
Susan Derrick
- Second WPC
Anne DeSalvo
- Dr Anne Carpenter
John DeSantis
- Band-Aid Nose Man
Dan Desmond
- Harry Odell
Ruth de Sosa
- Quinton's Mother
Paul DesRoches
- Paramedic
John Destrey
- Third Customer
- Mr Ballard [Trailer Park Manager]
Pat Destro
- Joan Scobie
William Devane
- General Mark A Suveg
Nathaniel Deveaux
- Detective Barron
Myrtle Devenish
- Old Woman
Ed Devereaux
- Albie
Eva De Viveiros
- Mikita Moldinardo [Laundress]
Cliff DeYoung
- Dr Jay Nemman
Jason Diablo
- Angry Man
Alex Diakun
- Curator
- Tarot Dealer
- Dr Fingers
- Gaunt Man
- Manager
Arnold Diamond
- Biebermann
Edward Diaz
- El Camino Owner
Pamela Diaz
- Maria Dorantes
Daniela Dib
- Mulder's Dance Partner
Dale Dickey
- Game Warden
Paul Dickson
- Uniformed Guard
John Diehl
- Wilson Pinker Rawls
Lauren Diewold
- Emily Christine Sim
Bryan Dilbeck
- Disabled Man
Garret Dillahunt
- Edward Skur
Chris Dillinger
- Raider
- First Russian Aide
Stephen Dimopoulos
- Ionesco
- Detective
Aurelio DiNunzio
- Antonio
- Detective
Dominique DiPrima
- Megan MacLean [News Reporter]
Jill Dixon
- Amanda's Mother
Shirley Dixon
- Mrs Johnson
Tim Dixon
- Bob
- Dr Richard W Godfrey
Badja Djola
- Wallace
Spike
Crendell Atherton
- Napoleon
Neech
Manley
Rick Dobran
- Sergeant Armando Gonzales
- Bartender
Michael Dobson
- First Marksman
- Sergeant Hynek
- BATF Agent
- US Marshall
Alex Doduk
- Young Samuel Hartley
Leo Dolan
- Murray
Anni Domingo
- Sister Noel
Susana Dominguez
- Nita Leon [Choreographer]
Eric Don
- Anthony Fogelman
Angela Donahue
- Alice Brant
Jay Donahue
- Detective Gouveia
Juliana Donald
- Nancy Kline
Elyse Donalson
- Elderly Woman
Peter Donat
- William Mulder
Chad E Donella
- Rob Roberts
Nicholas Donnelly
- Chief Inspector
Larry Dorf
- Pathology Assistant
Kate Dorning
- Nancy
Robert Dorning
- Padgett
John Do Serra
- Second Officer
David Doty
- Minister
Aaron Douglas
- Lindquist
Donald Douglas
- Eric Sutton
Sarah Douglas
- Dr Kate Ross
Brad Dourif
- Luther Lee Boggs
Anthony Douse
- Dusty
Bill Dow
- Father
- Dr Newton ME
- Dr Charles
Chuck
Burks
Ann Dowd
- Mrs Reed
Jim Dowdall
- Man
Brett Dowler
- Director
Jackie Downey
- Receptionist
Andrew Downie
Billy Drago
- Oral Peattie
Gabrielle Drake
- Julia
Patricia Drake
- Martha Ashley
Mark Drewry
- Joe
Jasmin Dring
- Mrs Tobalowski
Robyn Driscoll
- Technician
- Detective Joe Darnell
Minnie Driver
- Minnie Driver
Brian Drummond
- Lead Agent
Casey Dubois
- Little Boy
Kathleen Duborg
- Mother
- Prostitute
Sharon Duce
- Annie
Katlyn Alexandra Ducharme
- Snooty Girl
Daniel Duchovny
- Piney
David Duchovny
- Director
- Original Story
- Special Agent Fox William Mulder
- 1AEB12 All About Yves
- 1X79 The X-Files
- 1X01 Deep Throat
- 1X02 Squeeze
- 1X03 Conduit
- 1X04 The Jersey Devil
- 1X05 Shadows
- 1X06 Ghost in the Machine
- 1X07 Ice
- 1X08 Space
- 1X09 Fallen Angel
- 1X10 Eve
- 1X11 Fire
- 1X12 Beyond the Sea
- 1X13 GenderBender
- 1X14 Lazarus
- 1X15 Young at Heart
- 1X16 EBE
- 1X17 Miracle Man
- 1X18 Shapes
- 1X19 Darkness Falls
- 1X20 Tooms
- 1X21 Born Again
- 1X22 Roland
- 1X23 The Erlenmeyer Flask
- 2X01 Little Green Men
- 2X02 The Host
- 2X03 Blood
- 2X04 Sleepless
- 2X05 Duane Barry
- 2X06 Ascension
- 2X07 3
- 2X08 One Breath
- 2X09 Firewalker
- 2X10 Red Museum
- 2X11 Excelsis Dei
- 2X12 Aubrey
- 2X13 Irresistable
- 2X14 Die Hand der Verletz
- 2X15 Fresh Bones
- 2X16 Colony
- 2X17 End Game
- 2X18 Fearful Symmetry
- 2X19 Død Kalm
- 2X20 Humbug
- 2X21 The Calusari
- 2X22 F Emasculata
- 2X23 Soft Light
- 2X24 Our Town
- 2X25 The Anasazi
- 3X01 The Blessing Way
- 3X02 Paper Clip
- 3X03 DPO
- 3X04 Clyde Bruckman's Final Repose
- 3X05 The List
- 3X06 2Shy
- 3X07 The Walk
- 3X08 The Oubliette
- 3X09 Nisei
- 3X10 731
- 3X11 Revelations
- 3X12 War of the Coprophages
- 3X13 Syzygy
- 3X14 Grotesque
- 3X15 Piper Maru
- 3X16 Apocrypha
- 3X17 Pusher
- 3X18 Teso dos Bichos
- 3X19 Hell Money
- 3X20 Jose Chung's 'From Outer Space'
- 3X21 Avatar
- 3X22 Quagmire
- 3X23 Wetwired
- 3X24 Talitha Cumi
- 4X01 Herrenvolk
- 4X02 Unruhe
- 4X03 Home
- 4X04 Teliko
- 4X05 The Field Where I Died
- 4X06 Sanguinarium
- 4X07 Musings of a Cigarette Smoking Man
- 4X08 Paper Hearts
- 4X09 Tunguska
- 4X10 Terma
- 4X11 El Mundo Gira
- 4X12 Kaddish
- 4X13 Never Again
- 4X14 Leonard Betts
- 4X15 Memento Mori
- 4X16 Unrequited
- 4X17 Tempus Fugit
- 4X18 Max
- 4X19 Synchrony
- 4X20 Small Potatoes
- 4X21 Zero Sum
- 4X22 Elegy
- 4X23 Demons
- 4X24 Gethsemane
- 5X01 Unusual Suspects
- 5X02 Redux
- 5X03 Redux II
- 5X04 Detour
- 5X05 Christmas Carol
- 5X06 Post-Modern Prometheus
- 5X07 Emily
- 5X08 Kitsunegari
- 5X09 Schizogeny
- 5X10 Chinga
- 5X11 Kill Switch
- 5X12 Bad Blood
- 5X13 Patient X
- 5X14 The Red and the Black
- 5X15 Travellers
- 5X16 Mind's Eye
- 5X17 All Souls
- 5X18 The Pine Bluff Variant
- 5X19 Folie à Deux
- 5X20 The End
- The X-Files: Fight the Future
- 6ABX01 The Beginning
- 6ABX02 Drive
- 6ABX03 Triangle
- 6ABX04 Dreamland
- 6ABX05 Dreamland II
- 6ABX06 Terms of Endearment
- 6ABX07 Rain King
- 6ABX08 How the Ghosts Stole Christmas
- 6ABX09 Tithonus
- 6ABX10 SR 819
- 6ABX11 Two Fathers
- 6ABX12 One Son
- 6ABX13 Arcadia
- 6ABX14 Agua Mala
- 6ABX15 Monday
- 6ABX16 Alpha
- 6ABX17 Trevor
- 6ABX18 Milagro
- 6ABX19 Three of a Kind
- 6ABX20 The Unnatural
- 6ABX21 Field Trip
- 6ABX22 Biogenesis
- 7ABX01 Hungry
- 7ABX02 The Goldberg Variation
- 7ABX03 The Sixth Extinction
- 7ABX04 The Sixth Extinction II: Amor Fati
- 7ABX05 Millennium
- 7ABX06 Rush
- 7ABX07 Orison
- 7ABX08 The Amazing Maleeni
- 7ABX09 Signs & Wonders
- 7ABX10 Sein und Zeit
- 7ABX11 Closure
- 7ABX12 X-Cops
- 7ABX13 First Person Shooter
- 7ABX14 Theef
- 7ABX15 En Ami
- 7ABX16 Chimera
- 7ABX17 all things
- 7ABX18 Hollywood AD
- 7ABX19 Brand X
- 7ABX20 Fight Club
- 7ABX21 Je Souhaite
- 7ABX22 Requiem
- 8ABX01 Within
- 8ABX02 Without
- 8ABX03 Redrum
- 8ABX04 Patience
- 8ABX05 Roadrunners
- 8ABX06 Invocation
- 8ABX07 Via Negativa
- 8ABX08 Per Manum
- 8ABX09 Surekill
- 8ABX10 Salvage
- 8ABX11 The Gift
- 8ABX12 Badlaa
- 8ABX13 Medusa
- 8ABX14 This Is Not Happening
- 8ABX15 DeadAlive
- 8ABX16 Vienen
- 8ABX17 Empedocles
- 8ABX18 Three Words
- 8ABX19 Alone
- 8ABX20 Essence
- 8ABX21 Existence
- 9ABX19 / 9ABX20 The Truth
- The X-Files: I Want to Believe
- 1AYW01 My Struggle
- 1AYW02 Home Again
- 1AYW03 Mulder & Scully Meet the Were-Monster
- 1AYW04 Babylon
- 1AYW05 Founder's Mutation
- 1AYW06 My Struggle II
Thomas Duffy
- Officer Jeffrey Cahn
Mikal Dughi
- Dr Karetzky
Lee Duncan
- Al Cawdry
Nora Dunn
- Joanne Fletcher
Patrick Durkin
- KGB Agent Terkoff
- Wally
Simon Dutton
- Tree
Wayne Duvall
- Agent Jerry Lamana
Gillian Duxbury
- CI5 Agent Susie [Girl in Gym]
Barbara Dyke
- Dr Dominique Alepin
John Hart Dyke
- Flynn
Gene Dynarski
- Ernie Stefuniak