Marvel has confirmed a long list of names in the CAPTAIN AMERICA: CIVIL WAR cast. So long that the question should be ‘Who isn’t in this movie?’ A few characters aren’t mentioned so let’s divide those in two groups.

Likely to appear: Spider-Man, Samuel L. Jackson’s Nick Fury, Cobie Smulders’ Maria Hill.
Not likely to appear: Chris Hemsworth’s Thor, Mark Ruffalo’s The Hulk, Tom Hiddleston’s Loki.

Here is the official list of confirmed actors and characters in CAPTAIN AMERICA: CIVIL WAR (May 6, 2016):

“The film returns Chris Evans (“Captain America: The Winter Soldier,” Marvel’s “Avengers: Age of Ultron”) as the iconic Super Hero character Steve Rogers/Captain America along with Robert Downey Jr. (“Avengers: Age of Ultron,” Marvel’s “Iron Man 3”) as Tony Stark/Iron Man, Scarlett Johansson (“Avengers: Age of Ultron,” “Captain America: The Winter Soldier”) as Natasha Romanoff/Black Widow, Sebastian Stan (“Captain America: The Winter Soldier,” “Captain America: The First Avenger”) as Bucky Barnes/Winter Soldier, Anthony Mackie (“Avengers: Age of Ultron,” “Captain America: The Winter Soldier”) as Sam Wilson/Falcon, Paul Bettany (“Avengers: Age of Ultron,” “Iron Man 3”) as The Vision, Jeremy Renner (“Avengers: Age of Ultron,” Marvel’s “The Avengers”) as Clint Barton/Hawkeye, Don Cheadle (“Avengers: Age of Ultron,” “Iron Man 3”) as Jim Rhodes/War Machine and Elizabeth Olsen (“Avengers: Age of Ultron,” “Godzilla”) as Wanda Maximoff/Scarlet Witch.

After his debut in Marvel’s “Ant-Man” on July 17, 2015, Paul Rudd (“Ant-Man,” ”Anchorman 2: The Legend Continues”) will make his first appearance alongside the Avengers as Scott Lang/Ant-Man in “Captain America: Civil War.”

The film also includes outstanding additional cast, including Chadwick Boseman (“42,” “Get on Up”) as T’Challa/Black Panther, Emily VanCamp (“Captain America: The Winter Soldier,” “Revenge”) as Sharon Carter/Agent 13, Daniel Brühl (“Inglourious Basterds,” “Bourne Ultimatum”), Frank Grillo (“Captain America: The Winter Soldier,” “Warrior”) as Brock Rumlow/Crossbones, William Hurt (“A History of Violence,” Marvel’s “The Incredible Hulk”) as General Thaddeus “Thunderbolt” Ross and Martin Freeman (“The Hobbit: An Unexpected Journey,” “The Hobbit: The Battle of the Five Armies”).”

CAPTAIN AMERICA: CIVIL WAR Synopsis:

“‘Captain America: Civil War’ picks up where “Avengers: Age of Ultron” left off, as Steve Rogers leads the new team of Avengers in their continued efforts to safeguard humanity. After another international incident involving the Avengers results in collateral damage, political pressure mounts to install a system of accountability and a governing body to determine when to enlist the services of the team. The new status quo fractures the Avengers while they try to protect the world from a new and nefarious villain.”