Because of the much larger casts than films, this will be a long work-in-progress. I'll mainly be focusing on major/well-known characters and/or actors.
Adventures of Superman (1952)
Batman (January 1966)
John Astin -- Riddler / Edward Nigma
Anne Baxter -- Olga, Queen of the Cossacks
Milton Berle -- Louie the Lilac
Madge Blake -- Harriet Cooper
Victor Buono -- King Tut / William McElroy
Yvonne Craig -- Batgirl / Barbara Gordon
William Dozier -- Narrator
Frank Gorshin -- Riddler / Edward Nigma
Neil Hamilton -- Commissioner James Gordon
Carolyn Jones -- Marsha, Queen of Diamonds
Eartha Kitt -- Catwoman / Selina Kyle
Burgess Meredith -- Penguin / Oswald Cobblepot
Alan Napier -- Alfred Pennyworth
Julie Newmar -- Catwoman / Selina Kyle
Otto Preminger -- Mr. Freeze / Dr. Schivel
Vincent Price -- Egghead
Stafford Repp -- Chief O'Hara
Cliff Robertson -- Shame
Cesar Romero -- Joker
George Sanders -- Mr. Freeze / Dr. Schivel
Eli Wallach -- Mr. Freeze / Dr. Schivel
Burt Ward -- Robin / Dick Grayson
David Wayne -- Mad Hatter / Jervis Tetch
Adam West -- Batman / Bruce Wayne
Shazam! (September 1974)
Jackson Bostwick -- Captain Marvel / Billy Batson
John Davey -- Captain Marvel / Billy Batson
Michael Gray -- Billy Batson
Les Tremayne -- Mentor
Wonder Woman (November 1975)
Norman Burton -- Joe Atkinson
Lynda Carter -- Wonder Woman / Diana Price
Beatrice Colen -- Etta Candy
Richard Eastham -- General Philip Blankenship
Carolyn Jones -- Hippolyta
Cloris Leachman -- Hippolyta
Saundra Sharp -- Eve Welch
Beatrice Straight -- Hippolyta
Lyle Waggoner -- Steve Trevor, Steve Trevor Jr.
Debra Winger -- Wonder Girl / Drusilla
Legends of the Superheroes (January 1979)
Jeff Altman -- Weather Wizard / Mark Mardon
Aleshia Brevard -- Giganta
Ruth Buzzi -- Aunt Minerva
Charlie Callas -- Sinestro
Pat Carroll -- Esther Hol
Garrett Craig -- Captain Marvel / Billy Batson
Gabriel Dell -- Mordru
June Gable -- Rhoda Rooter
Frank Gorshin -- Riddler / Edward Nigma
Rod Haase -- Flash / Barry Allen
Barbara Joyce -- Huntress / Helena Wayne
Ed McMahon -- Himself
Howard Morris -- Dr. Sivana
Mickey Morton -- Solomon Grundy
Howard Murphy -- Green Lantern / Hal Jordan
Bill Nuckols -- Hawkman / Katar Hol
Gary Owens -- Narrator
Brad Sanders -- Ghetto Man
William Schallert -- Scarlet Cyclone
Burt Ward -- Robin / Dick Grayson
Marsha Warfield -- Woman in phone booth
Danuta Wesley -- Black Canary / Dinah Lance
Adam West -- Batman / Bruce Wayne
Alfie Wise -- Atom / Ray Palmer
Superboy (1988)
Sherman Howard -- Lex Luthor
Scott James Wells -- Lex Luthor
Swamp Thing (1990)
The Flash (1990)
Lois & Clark: The New Adventures of Superman (1993)
Dean Cain -- Superman / Clark Kent
Teri Hatcher -- Lois Lane
John Shea -- Lex Luthor
Justice League of America (December 1997)
Elisa Donovan -- Cheryl
Miguel Ferrer -- Weather Man / Dr. Eno
Michelle Hurd -- Fire / B.B. DaCosta
Kenny Johnston -- Flash / Barry Allen
John Kassir -- Atom / Ray Palmer
David Krumholtz -- Martin Walters
Kim Oja -- Ice / Tori Olafsdotter
Ron Pearson -- Arliss Hopke
Matthew Settle -- Green Lantern / Guy Gardner
David Ogden Stiers -- Martian Manhunter / J'onn J'onzz
Jason Weissbrod -- Drazen
Smallville (2001)
Callum Blue -- Major Zod
Bradley Stryker -- Deadshot / Floyd Lawton
Tom Welling -- Superman / Clark Kent / Kal-El
Birds of Prey (2002)
Ian Abercrombie -- Alfred Pennyworth
Casey Elizabeth Easlick -- Catwoman / Selina Kyle
Dina Meyer -- Oracle / Barbara Gordon
Shemar Moore -- Jesse Reese
Mia Sara -- Harley Quinn / Harleen Quinzel
Ashley Scott -- Huntress / Helena Kyle
Rachel Skarsten -- Black Canary / Dinah Lance-Redmond
Arrow (2012)
Stephen Amell -- Green Arrow / Oliver Queen
Manu Bennett -- Deathstroke / Slade Wilson
Katie Cassidy -- Black Canary / Laurel Lance
Colin Donnell -- Tommy Merlyn
Andrew Dunbar -- Firefly / Garfield Lynns
Colton Haynes -- Arsenal / Roy Harper
Willa Holland -- Speedy / Thea Queen
Matt Nable -- Ra's al Ghul
Emily Bett Rickards -- Overwatch / Felicity Smoak
Michael Rowe -- Deadshot / Floyd Lawton
Gotham (September 2014)
Morena Baccarin -- Leslie Thompkins
Camren Bicondova -- Selina Kyle
Nathan Darrow -- Mr. Freeze / Victor Fries
Jete Laurence -- Barbara Gordon
Donal Logue -- Harvey Bullock
David Mazouz -- Bruce Wayne
Ben McKenzie -- James Gordon
Cameron Monaghan -- Jerome Valeska, Jeremiah Valeska
Sean Pertwee -- Alfred Pennyworth
Erin Richards -- Barbara Kean
Lili Simmons -- Catwoman / Selina Kyle
Cory Michael Smith -- Riddler / Edward Nygma
Charlie Tahan -- Scarecrow / Jonathan Crane
Robin Lord Taylor -- Penguin / Oswald Cobblepot
The Flash (October 2014)
Robbie Amell -- Firestorm / Ronnie Raymond
Morena Baccarin -- Gideon
Alexa Barajas -- Ultraviolet / Esperanza Garcia
Violette Beane -- Jesse Quick / Jesse Wells
Tobin Bell -- Savitar, Alchemy
Richard Brooks -- Gregory Wolfe
Clancy Brown -- Wade Eiling
Jessica Camacho -- Gypsy / Cynthia
Tom Cavanagh -- Harrison Wells, Reverse-Flash / Eobard Thawne
Kindall Charters -- Godspeed / August Heart
Rick Cosnett -- Eddie Thawne
Darren Criss -- Music Meister
Grey Damon -- Mirror Master / Sam Scudder
Keith David -- Solovar (voice)
Efrat Dor -- Eva McCulloch
Anne Dudek -- Tracy Brand
Kim Engelbrecht -- Marlize DeVoe
Tom Felton -- Julian Albert
Victor Garber -- Firestorm / Martin Stein
LaMonica Garrett -- Monitor / Mar Novu, Anti-Monitor / Mobius
Everick Golding -- Trevor Shinck
Devon Graye -- Trickster / Axel Walker
Grant Gustin -- Flash / Barry Allen
Mark Hamill -- Trickster / James Jesse
Michelle Harrison -- Nora Allen
David Hayter -- King Shark (voice)
Roger Howarth -- Mason Bridge
Troy James -- Rag Doll / Peter Merkel
Malese Jow -- Linda Park
Jessica Parker Kennedy -- XS / Nora West-Allen
Chris Klein -- Cicada / Orlin Dwyer
Phil LaMarr -- Rag Doll (voice)
Matt Letscher -- Reverse-Flash / Eobard Thawne
Keiynan Lonsdale -- Kid Flash / Wally West
Jesse L. Martin -- Joe West
Wentworth Miller -- Captain Cold / Leonard Snart
Danielle Nicolet -- Cecile Horton
Danielle Panabaker -- Killer Frost / Caitlin Snow
Dan Payne -- Shay Lamden
Candice Patton -- Iris West
Amanda Pays -- Tina McGee
Donna Pescow -- Sharon Finkel
Ciara Renee -- Hawkgirl / Kendra Saunders
Brandon Routh -- Atom / Ray Palmer, Superman / Clark Kent (Earth-96)
Patrick Sabongui -- David Singh
Katee Sackhoff -- Amunet Black
Neil Sandilands -- Thinker / Clifford DeVoe
Hartley Sawyer -- Elongated Man / Ralph Dibny
Teddy Sears -- Zoom / Hunter Zolomon
John Wesley Shipp -- Henry Allen, Flash / Jay Garrick, Flash / Barry Allen
David Sobolov -- Gorilla Grodd (voice)
Mark Sweatman -- Matthew Norvok
Tony Todd -- Zoom (voice)
Carlos Valdas -- Vibe / Cisco Ramon
Shantel VanSanten -- Patty Spivot
Susan Walters -- Carla Tannhauser
Vanessa A. Williams -- Francine West
BD Wong -- Godspeed (voice)
Constantine (October 2014)
Supergirl (October 2015)
Odette Annable -- Reign / Samantha Arias
Melissa Benoist -- Supergirl / Kara Danvers / Kara Zor-El
Andrea Brooks -- Eve Teschmacher
Mehcad Brooks -- Guardian / James Olsen
Calista Flockhart -- Cat Grant
LaMonica Garrett -- Monitor / Mar Novu
Mark Gibbon -- General Zod
Julie Gonzalo -- Acrata / Andrea Rojas
David Harewood -- Martian Manhunter / J'onn J'onzz
April Parker Jones -- Colonel Lauren Haley
Jeremy Jordan -- Toyman / Winslow Schott Jr.
Chyler Leigh -- Alex Danvers
Floriana Lima -- Maggie Sawyer
Nicole Maines -- Dreamer / Nia Nal
Camille Marty -- Young Lena Luthor
Jordan Mazarati -- Young Alex Danvers
Katie McGrath -- Lena Luthor
Staz Nair -- William Dey
Olivia Nikkanen -- Young Alex Danvers
Jesse Rath -- Brainiac 5 / Querl Dox
Azie Tesfal -- Kelly Olsen
Izabela Vidovic -- Young Kara
Malina Weissman -- Young Kara
Sam Witwer -- Agent Liberty / Benjamin Lockwood
Chris Wood -- Mon-El
Legends of Tomorrow (January 2016)
Tala Ashe -- Zari Tomaz, Zari Tarazi
Arthur Darvill -- Rip Hunter
Benjamin Diskin -- Beebo (voice)
Franz Drameh -- Firestorm / Jefferson "Jax" Jackson
Courtney Ford -- Nora Darhk
Victor Garber -- Firestorm / Martin Stein
LaMonica Garrett -- Monitor / Mar Novu, Anti-Monitor
Falk Hentschel -- Hawkman / Carter Hall
Matt Letscher -- Reverse Flash / Eobard Thawne
Keiynan Lonsdale -- Kid Flash / Wally West
Caity Lotz -- White Canary / Sara Lance
Jes Macallan -- Ava Sharpe
Wentworth Miller -- Captain Cold / Leonard Snart, Citizen Cold / Leo Snart
Andrew Morgado -- Hell Hound / Gary Junior (voice)
John Noble -- Mallus
Amy Pemberton -- Gideon (voice)
Dominic Purcell -- Heat Wave / Mick Rory
Ciara Renee -- Hawkgirl / Kendra Saunders
Paul Reubens -- Dybbuk (voice)
Maisie Richardson-Sellers -- Vixen / Amaya Jiwe, Clotho / Charlie
Brandon Routh -- Atom / Ray Palmer
Matt Ryan -- John Constantine
Anna Deavere Smith -- Cinnamon / Kendra Saunders
Shayan Sobhian -- Behrad Tarazi
David Sobolov -- Gorilla Grodd (voice)
Olivia Swann -- Astra Logue
Adam Tsekhman -- Gary Green
Ramona Young -- Mona Wu
Nick Zano -- Steel / Nate Heywood
Black Lightning (January 2018)
Christine Adams -- Lynn Stewart
Fallyn Brown -- Young Jennifer Pierce
Jordan Calloway -- Painkiller / Khalil Payne
Damon Gupton -- Bill Henderson
Marvin "Krondon" Jones III -- Tobias Whale
Kaden Washington Lewis -- Young Jefferson Pierce
China Anne McClain -- Lightning / Jennifer Pierce
James Remar -- Peter Gambi
Chantal Thuy -- Grace Choi
Cress Williams -- Black Lightning / Jefferson Pierce
Nafessa Williams -- Thunder / Blackbird / Anissa Pierce
Krypton (March 2018)
Gordon Alexander -- Quex-Ul
Sarah Armstrong -- Kiyo
Dempsey Bovell -- Van-Zod
Georgina Campbell -- Lyta-Zod
Elliot Cowan -- Daron-Vex
Cameron Cuffe -- Seg-El
Wallis Day -- Nyssa-Vex
Rupert Graves -- Ter-El
Rasmus Hardiker -- Kem
Sonita Henry -- Raika
Asiatu Koroma -- Young Jayna-Zod
Lukas Loughran -- Junra
Paula Malcomson -- Charys-El
Ian McElhinney -- Val-El
Aoibhinn McGinnity -- Lis-Ser
India Mullen -- Sevi
Staz Nair -- Doomsday / Dax Baron
Toni O'Rourke -- Wedna-El
Ann Ogbomo -- Jayna-Zod
Aaron Pierre -- Dev-Em
Alexis Raben -- Rhom
Blake Ritson -- Brainiac
Colin Salmon -- General Dru-Zod
Emmett J. Scanlan -- Lobo
Tipper Seifert-Cleveland -- Ona
Shaun Sipos -- Adam Strange
Andrea Vasiliou -- Kol-Da
Hannah Waddingham -- Jax-Ur / Sela-Sonn
Nicholas Witham-Mueller -- Young Seg-El
Titans (October 2018)
Tait Blum -- Young Hank Hall
Teagan Croft -- Raven / Rachel Roth
Anna Diop -- Starfire / Kory Anders / Koriand'r
Afrodite Drossos -- Young Donna Troy
Andi Hubick -- Teenager Donna Troy
Minka Kelly -- Dove / Dawn Granger
Conor Leslie -- Wonder Girl / Donna Troy
Esai Morales -- Deathstroke / Slade Wilson
Joshua Orpin -- Subject 13 / Conner
Alan Ritchson -- Hawk / Hank Hall
Ryan Potter -- Beast Boy / Garfield Logan
Brenton Thwaites -- Robin / Nightwing / Dick Grayson
Curran Walters -- Robin / Red Hood / Jason Todd
Titus Welliver -- Lex Luthor
Chelsea Zhang -- Rose Wilson
Doom Patrol (February 2019)
Curtis Armstrong -- Ezekiel
Alimi Ballard -- Joshua Clay
Matt Bomer -- Negative Man / Larry Trainor
April Bowlby -- Elasti-Woman / Rita Farr
Jon Briddell -- Darren Jones
Vanessa Carter -- Darling-Come-Home
Kyle Clements -- John Bowers
Kat Cressida -- Darling-Come-Home
Timothy Dalton -- Chief / Niles Caulder
Tom Fitzpatrick -- John Bowers (old)
Brendan Fraser -- Robotman / Cliff Steele
Michelle Gomez -- Madame Rouge / Laura De Mille
Diane Guerrero -- Crazy Jane / Kay Challis
Will Kemp -- Mento / Steve Dayton
Lex Lang -- Candlemaker
Charmin Lee -- Elinor Stone
Bethany Anne Lind -- Clara Steele
Jonathan Lipow -- Monsieur Mallah
Devan Chandler Long -- Flex Mentallo
Alec Mapa -- Animal-Vegetable-Mineral Man / Steve Larson
Julie McNivel -- Sheryl Trainor
Abi Monterey -- Dorothy Spinner
Phil Morris -- Silas Stone
Karen Obilom -- Roni Evers
Sendhil Ramamurthy -- Mister 104
Skye Roberts -- Kay Challis
Riley Shanahan -- Brain
Mark Sheppard -- Willoughby Kipling
Tommy Snider -- Beard Hunter / Ernest Franklin
Brian T. Stevenson -- Herschel
Alan Tudyk -- Mr. Nobody / Eric Morden
Jovian Wade -- Cyborg / Victor Stone
Madeline Zima -- Space Case / Casey Brinke
Swamp Thing (May 2019)
Pennyworth (July 2019)
Batwoman (2019)
Watchmen (October 2019)
Yahya Abdul-Mateen II -- Cal Abar / Doctor Manhattan / Jon Osterman
Jovan Adepo -- Young Will Reeves
Jessica Camacho -- Pirate Jenny
Hong Chau -- Lady Trieu
Elyse Dinh -- Adult Bian
Frances Fisher -- Jane Crawford
Louis Gossett Jr. -- Hooded Justice / Will Reeves
Faithe Herman -- Young Angela Abar
Jolie Hoang-Rappaport -- Bian
Andrew Howard -- Red Scare
Jeremy Irons -- Ozymandias / Adrian Veidt
Don Johnson -- Judd Crawford
Regina King -- Sister Night / Angela Abar
Paul Labes -- Young Wade Tillman
Alexis Louder -- Ruth Williams
Jacob Ming-Trent -- Panda
Tom Mison -- Mr. Phillips, Game Warden
Tim Blake Nelson -- Looking Glass / Wade Tillman
Steven Norfleet -- O.B. Williams
Zak Rothera-Oxley -- Young Jon Osterman
Dylan Schombing -- Topher Abar
Jean Smart -- Silk Spectre / Laurie Blake
Lily Rose Smith -- Rosie Abar
Adelynn Spoon -- Emma Abar
Sara Vickers -- Ms. Crookshanks
James Wolk -- Joe Keene Jr.
Stargirl (2020)