Superman - Henry Cavill
Batman - Garrett Hedlund
Wonder Woman - Gal Gadot
Flash/Barry Allen - Jake Gyllenhaal(?)
Green Lantern/Hal Jordan - Dan Amboyer
Aquaman - Armie Hammer, Liam McIntyre
Cyborg - Ray Fisher
Shazam - Channing Tatum
Martian Manhunter - Peter Mensah
Green Arrow - Charlie Hunnam, Ewan McGregor

Superheroes
Superman - Rick Malambri
Batman - Ben Affleck
Wonder Woman - Gal Gadot
Flash - Luke Mitchell
Aquaman - Kellen Lutz
Martian Manhunter - Idris Elba
Green Lantern (HJ) - Brian Austin Greene
Firestorm - Garrett Hedulund
Cyborg - Tyrese Gibson
Vixen - Zoe Saldana
Hawkgirl - Emma Stone
Hawkman - Chris Pratt
Supporting cast
Steve Trevor - Jensen Ackles
Lois Lane - Ashley Greene
Mera - Karin Slater
Iris West - Nathalie Portman
Stupid P'takh!

Until the directors and producers get their beep together, I would not waste any A-list talent on the DCEU. Therefore, my casting for Justice League would be:
Superman: Carrot Top
Batman: Hulk Hogan
Aquaman: The kid who played McLovin
Wonder Woman: Rosie O' Donnell
The Flash: the decomposed remains of Phillip Seymour Hoffman
This is a cast befitting the quality of Zack Snyder's directing.

Edit #2
Other additional
Justice League Dark
cast members
Madame Xanadu

• Monica Bellucci
  Deadman
• Jake Gyllenhaal
  Raven
• Mary Elizabeth Winstead
  Swamp Thing
• Ron Perlman, Andy Serkis
  Etrigan/The Demon/Jason Blood
• Michael Sheen
  Spectre/Jim Corrigan
• Christopher Lambert

Edit

• I would also like to throw in the following to my list above:
  The Villains
  Ocean Master

• Wes Bentley, Richard Armitage, Clive Owen
  Black Manta
• Omari Hardwick, Michael Kenneth Williams
  Zoom/Eobard Thawne
• Matthew McConaughey
  Mirror Master
• Edward Norton
  Darkseid
• Michael C. Hall, Ving Rhames
  Vandal Savage
• Tom Hardy
  Lobo
• Mickey Rourke
  Maxwell Lord
• Richard Tyson (
  I know it's a stretch but he can play a very manipulating villain if given the chance
  )
  Anti-Monitor
• Oscar Isaac
  Darkseid's elite & Female Furies
  Stepphenwolf
• Charles Dance (elite)
  Granny Goodness
• Kathy Bates (elite)
  Glorious Godfrey
• Hugo Weaving (elite)
  Bernadeth
• Helena Bonham Carter
  Big Barda
• Jessica Biel
  Gilotina
• Ronda Rousey
  Lashina
• Gina Carano
  Mad Harriet
• Taryn Manning
  Stompa
• Tamina Snuka
  Justice League Dark
  John Constantine
• Colin Farrell, Stephen Dorff, Matt Ryan
  Zatanna
• Alexandra Daddario

My
Justice Leauge
cast wish list.
Batman

• Ben Affleck
  Superman
• Henry Cavill, Matt Bomer
  Wonder Woman
• Gal Gadot, Jaimie Alexander, Megan Gale
  Flash/Barry Allen
• Ryan Gosling or Michael Rosenbaum (Barry should have blonde hair or close to it)
  Green Lantern/Hal Jordan
• Patrick Wilson, Armie Hammer, or Sam Claflin
  Aquaman
• Jason Momoa, Travis Fimmel
  Cyborg
• Ray Fisher
  Martian Manhunter
• Peter Mensah or Lance Reddick (unless somehow Harry Lennix is really J'onn J'onzz in disguise)
  Shazam
• Alan Ritchson
  Green Arrow/Oliver Green
• Charlie Hunnam, Garrett Hedlund
  Dinah Laurel Lance/Black Canary
• Katheryn Winnick
  Supergirl/Kara Zor-El
• Saoirse Ronan
  Nightwing/Dick Grayson
• Kevin Zegers
  Batgirl/Oracle/Barbara Gordon
• Rebecca Ferguson
  Hawkman
  &
  Hawkgirl
  belong to Earth-2's
  Justice Society
  As for
  John Stewart/Green Lantern
  (
  Idris Elba
  ) aka once his marvel contract is up which will be after "Thor: Ragnarok" &
  Guy Gardner/Green Lantern
  (
  Seann William Scott
  )
  For other potential villains
  Brainiac
• Matthew Goode
  Desaad
• Michael Wincott (
  Darkseid's elite
  )
  Sinestro
• Luke Evens
  Cheetah
• Charlize Theron
  Circe
• Carice van Houten
  Ares
• Sean Bean
  The Penguin/Oswald Cobblepot
• Paul Giammati
  The Riddler/Edward Nigma
• Eddie Redmayne, Matt Smith
  Catwoman/Selina Kyle
• Eva Green
  Poison Ivy/Pamela Isley
• Jessica Chastain
  Raz Al Ghul
• Jason Isaacs
  Talia al Ghul
• Lena Headey, Kate Beckinsale
  Two-Face/Harvey Dent
• Jim Cavizel
  Black Mask
• Sean Penn
  Hugo Strange
• Jackie Earle Haley
  Bane
• Javier Bardem
  Mr. Freeze/Dr. Victor Fries
• Ralph Fieness
  Still trying to figure out who should play
  Zoom/Eobard Thawne
  ,
  Mirror Master
  ,
  Darkseid
  ,
  Anti-Monitor
  ,
  Black-Manta
  ,
  Ocean Master

Batman - Frank Grillo or Antony Starr (Ben Affleck is the worst since Clooney)
Superman - Wes Bently (I'd be cool with Cavill still but I think if Wes got buff he'd own it) or Jonathon Tucker
Wonder Woman - Hayley Atwell,Gemma Arterton, Jessica Biel(white)/ Hannah Simone, Nona Gaye, Gina Torres or Garcelle Beauvais(ethnic)
Flash/Barry Allen - Ryan Reynolds
Green Lantern/Hal Jordan - Gabriel Macht
Aquaman - Karl Urban or Chris Hemsworth(white)/ Edgar Ramirez or Jason Mamoa(ethnic)
Cyborg - Trai Byers
Hawkgirl (or Hawkwoman) - Jurnee Smollett-Bell or Rosario Dawson
Hawkman - Joel Edgerton or Nate Parker
Martian Manhunter - Denis Haysbert
Nightwing - Brenton Thwaites
Green Lantern (John Stewart) - Columbus Short
Green Lantern (Kyle Rayner) - Tyler Hoechlin
Captain Marvel - Mark Whalberg, Alan Ritchson or Rob Riggle
Green Arrow - Tom Pelphrey or Alexander Skarsgard
Black Canary - Katheryn Winnick
Vixen - Grace Gealey
Doctor Fate (Kent Nelson) - Gerard Butler
Zatanna - Natalie Martinez
Steel - Henry Simmons
Booster Gold - Joel Mchale
Elongated Man - JGL
Captain Atom - MAtt Bomer
Darkseid - Nonso Anozie
Deathstroke - Sylvester Stallone
Vandal Savage - Tom Hardy
Black Adam - Dwayne Johnson
Dr. Sivana - Faran Tahir
Maxwell Lord - Jeff Daniels
Prometheus - Rodrigo Santoro
Joker- Giovanni Ribisi or Walton Goggins
Felix Faust - Rufus Sewell
Lex Luthor - Jesse Eisenberg/Jamie Bell or Alec Baldwin
Brainiac - Michael C. Hall
Mongul - Kevin McKidd
Bizarro - Chris Evans or Jake Gyllenhall
Lobo - Jason Mamoa or Micheal Jai White
Metallo - David Wenham
Parasite - Timothy Olyphant
Ras Al Ghul - MArk Strong
Talia Al Ghul - Golshifteh Farahani
The Riddler - Edward Norton or Matthew Rauch
Catwoman - Abbie Cornish
Black Mask - SEan Penn or Robert Knepper
Two Face - Liev Schreiber
The Penguin - Joe Pesci, Emilio Estevez or Paul Giamatti
Hugo Strange - Joseph Finnes, Tim Roth or Cliff Curtis
Clayface - Nic Cage
Mr. Freeze - Jeff Bridges or Clive Owen
Poison Ivy - Eva Green
Scarecrow - Jeff Goldblum
Hush - Toby Stephens
Cheetah - Angela Basset
Hades - Mads Mikklesen
Circe - Olivia Wilde
Doctor Psycho - Warwick Davis
Giganta - Katie Sackhoff
Baroness von Gunther - Lena Headey
Ocean Master - Eric Bana or Luke Evans
Black Manta - Chiwetel Ejiofor
King Shark - Nathan Jones
Reverse Flash - Matthew Mcougnhey
Gorilla Grodd - Eamonn Walker
Captain Cold - Jude Law
Mirror Master - Nathan Fillion
The Trickster - Shia Labeof
Weather Wizard - Travis Fimmel
Sinestro - James Purefoy
Star Sapphire - Emmy Rossum
Guy Gardener- Bradley Cooper
Supergirl- Aly Michalka
Harley Quinn- Amanda Bynes or Juliette Lewis

yep, although I really like Afflecks version in BvS, I do agree that
Josh Brolin
is perfect for the part. Seeing him in Oldboy is seeing a perfect old grumpy Batman, imo.

** I am normally not a praying man, but if you are up there, please save me Superman **

Superman - Jon Hamm
Batman - Josh Brolin
Wonder Woman - Gina Carano
Green Lantern - Nathan Fillion
The Flash - Chris Pine
Martian Manhunter - Michael Dorn
Aquaman - Alexander Skarsgard
Captain Marvel - Channing Tatum
Green Arrow - Ryan Gosling
Black Canary - Elizabeth Banks

This message has been deleted.

Batman - Matthew McConaughey or Karl Urban (As long as Batman not is a murderous has-been, I'm happy)
Superman - Keep Cavill "But get a director that can work with him.)
Wonder Woman - Gina Carano
Flash/Barry Allen - Grant Gustin
Martian Manhunter - Idris Elba
Green Lantern/Hal Jordan - Joseph Gordon-Levitt? (I would rather see any lantern but Hal, he's just so boring, Would personally prefer Guy Gardner)
Aquaman - Alexander Skarsgrd
Cyborg - Quinton Aaron
Hawkgirl - Rosario Dawson
Hawkman - I would'nt mind if they left out this character.
The Atom - Brandon Routh
I try to find my name so i don't have to go to school tomorrow.

Olivia Wilde for Barbara, Lake Bell would make the perfect Hawkgirl, and Michael C. Hall for Thomas Elliot. Unless Matt Damon beats him to it.

There were some rumors a while ago (a year or two) that Armie Hammer was in the running for the current Batman.

Mine:
Batman - Armie Hammer
Superman - Garett Hedlund
Wonder Woman - Gina Carano
Flash/Barry Allen - Calum Worthy
Green Lantern/John Stewart - Michael Ealy
Hawkgirl - Emily Blunt
Lex Luthor - Michael C Hall

Batman-Affleck is excellent, however I might go with David Boreanaz
Supes-Jensen Ackles, Henry Cavill is great in the part though. Agree with the posters saying go with Matt Bomer too.
Wonder Woman-Lynn Collins or Cote de Pablo.
Flash-Dean Gyer
Green Lantern-Andrew Garfield looks the part, but his acting is annoying. John Krasinski as the OP suggested (albeit, a different character)
Aquaman-Jason Lewis
Cyborg-Alm Ameen

For the DC superheroes yet to be cast, I would like:
Martian Manhunter - Doug Jones (performance) and Patrick Stewart (voice)
Nightwing - Theo James
Green Lantern (Hal Jordan) - Sam Claflin
Green Lantern (John Stewart) - Aldis Hodge
Green Lantern (Kyle Rayner) - Jack Reynor
Captain Marvel - Armie Hammer
Hawkman - Sam Worthington
Hawkwoman - Lynn Collins
Green Arrow - Charlie Hunnam
Black Canary - Emily Blunt
Vixen - Naomie Harris
Doctor Fate (Kent Nelson) - Edward Norton
Zatanna - Alexandra Daddario
Steel - Derek Luke
Booster Gold - Garrett Hedlund
Elongated Man - Dave Franco
Captain Atom - Patrick Wilson
Now then as for the potential casting for the supervillains yet to appear in the DCEU, what I have in mind included:
JUSTICE LEAGUE
Darkseid - Richard Armitage
Deathstroke - Mark Strong
Vandal Savage - Liev Schreiber
Black Adam - Dwayne Johnson
Dr. Sivana - John Hurt
Maxwell Lord - Jon Hamm
Prometheus - Christian Bale
Despero - Ian Whyte
Felix Faust - Charles Dance
SUPERMAN
Lex Luthor Sr. - Bryan Cranston
Brainiac - Jermaine Clement
Mongul - Liam Neeson (voice)
Bizarro - Kellan Lutz
Lobo - Tom Hardy
Metallo - James Badge Dale
Parasite - Ben Foster
Toyman - Steve Buscemi
BATMAN
Ras Al Ghul - Ralph Fiennes
Talia Al Ghul - Eva Green
The Riddler - Michael Sheen
Catwoman - Rebecca Ferguson
Black Mask - Corey Stoll
Two Face - Joel Edgerton
The Penguin - Jared Harris
Hugo Strange - John Malkovich
Clayface - Jason Clarke
Mr. Freeze - Adrien Brody
Poison Ivy - Christina Hendricks
Red Hood - Jack O'Connell
Scarecrow - Burn Gorman
Hush - Matt Damon
WONDER WOMAN
Cheetah - Charlize Theron
Hades - Viggo Mortensen
Circe - Angelina Jolie
Doctor Psycho - Peter Dinklage
Giganta - Gwendoline Christie
Baroness von Gunther - Diane Kruger
AQUAMAN
Ocean Master - Karl Urban
Black Manta - Jamie Foxx
King Shark - Nathan Jones
FLASH
Reverse Flash - Josh Lucas
Gorilla Grodd - Toby Kebbell (voice)
Captain Cold - Eric Bana
Mirror Master - Ewan McGregor
The Trickster - Jim Carrey
Weather Wizard - Michael C. Hall
GREEN LANTERN
Sinestro - Luke Evans
Anti Monitor - Bill Nighy (voice)
Star Sapphire - Keira Knightley
Hank Henshaw - Brandon Routh
What's missing in movies is same as in society: a good sense of work ethic and living up to ideals.

Just to clarify my casting decisions.
Superman

• While I like Cavill as Superman, I don't think he is able to bring his full acting chops to the role. Also, the script he's been given doesn't help. I just think Matt Bomer is a better actor.
  Flash, Aquaman and Cyborg
• Although I'll give the DCEU actors the benefit of the doubt, they look pretty good so far, I don't think Ezra Miller and Jason Momoa look or seem like Barry Allen or Arthur Curry to me. I feel that the actors I chose seem more like their respective characters to me and are a better fit.
  Green Lantern
• diversity. We'll see how good Diego Luna is in Rogue One.
  Hawkgirl/Hawkwoman
• Three words: Edge. of. Tomorrow.
  Hawkman
• he's married to Emily Blunt, so

Batman and Superman is owned by
Affleck
and
Cavill
. I have never been this satisfied about those characters on the silver screen.
Wonder Woman is
Gal Gadot
to me. She blew me away in BvS. will she stand the test, only time will tell, but I got a good feeling
As for the rest, I will give the benefit of the doubt to
Jason Momoa
. I am very sceptial about
Ezra Miller
as The Flash, and would likely go perhaps for
Scott Caan
Green Lantern/Hal Jordan -
John Krasinski
Hawkman -
Joel Edgerton
Hawkgirl/Woman -
Noomi rapace
Martian Manhunter -
Peter Mensah
I am with you on your Cyborg

** I am normally not a praying man, but if you are up there, please save me Superman **

I'm happy with the current casting although if there had been changes I wouldn't mind, though hands of Cavill. He is perfect. Also I REALLY like Affleck and Momoa in their characters.

I got it! Nicole Kidman as Circe!
What's missing in movies is same as in society: a good sense of work ethic and living up to ideals.

lol touch

Why?
She's not dead or anything.
You have Brandon Routh on your list. That one is too late.

A tad late for her to be in a big film again ain't it?
What's missing in movies is same as in society: a good sense of work ethic and living up to ideals.

Thora Birch!