Captain Nazi (Baron Albrecht Krieger) is a Fawcett Comics and DC Comics supervillain, and rival of Captain Marvel and Captain Marvel Jr.

Captain Nazi made his first live-action appearance in a 2016 second season episode of The CW TV series DC's Legends of Tomorrow, played by André Eriksen.

Captain Nazi first appeared in Master Comics #21 (December 1941) and was created by William Woolfolk and Mac Raboy.

The super-strong Captain Nazi was genetically altered by his scientist father, and developed into the "perfect specimen" to fight for Adolf Hitler and the Axis powers during World War II. He is given superhuman strength and stamina, and a special gas that allows him to fly. He is sent to battle American superheroes by the Nazis after his power is demonstrated to them by Hitler, and some of the heroes are shown. Nazi first appeared in Master Comics #21 (December 1941), in opposition to both Captain Marvel and Bulletman. During the second half of his battle with Marvel in Whiz Comics #25 (published the same month), Nazi attacks two innocent bystanders who happened to be fishing near the scene of the battle, after they pull him out of the lake, and he escapes in their boat. One of them, an old man named Jacob Freeman, is killed, but the old man's teenage grandson Freddy Freeman is saved by Captain Marvel, although he is crippled and his back broken with a hit from an oar while Nazi escapes in the boat. Due to Captain Marvel bestowing part of his power to him, Freddy becomes Captain Marvel Jr. He is then sent to defeat Captain Nazi by Captain Marvel.

Junior, crippled in his Freddy Freeman form by the attack, continues to hold a vendetta against Nazi, and the two frequently battle one another. Nazi also serves as a member of Mister Mind's Monster Society of Evil, one of the most powerful organisations of villains in the world which included Adolf Hitler, and assists their first plan to steal magic fortune-telling pearls from a princess, leading Captain Marvel to their hideout, and revealing their existence, during the World War II years, before making his final Fawcett Comics appearance in the story "General Nippon's Elusive Earthplane", published in Captain Marvel, Jr. #19 in 1944.

Captain Nazi appeared only sporadically in DC Comics' 1970s/1980s revival of the Marvel Family characters under the title Shazam!, save for reprints of the original Fawcett stories. Nazi's first appearance in a new DC Comics story was in Shazam! #34 (March- April 1978).

Following writer Roy Thomas and artist Tom Mandrake's new interpretation of the Captain Marvel mythos in the 1987 four-issue miniseries Shazam!: The New Beginning, Captain Nazi was re-introduced in a 1988 four-part story in Action Comics Weekly issues #623-626. Captain Nazi himself, however, only appeared in #624-626. The story was written by Thomas and his wife Dann Thomas, with art by Rick Stasi and Rick Magyar. The new Captain Nazi is a young Neo-Nazi named Lester Abernathy. Abernathy is given his "Captain Nazi" powers, costume and codename by a Neo-Nazi organization called the Sons of Valhalla and battles Captain Marvel. This version of the character made no further appearances and was subsequently retconned out of existence by the 1994 The Power of Shazam! graphic novel, which again altered Captain Marvel's background and continuity.

Captain Nazi was introduced into the modern DC Universe in Jerry Ordway's The Power of Shazam! series in 1995. In the modern series, Nazi had been active during the 1940s, battling World War II-era heroes such as Bulletman, Minute-Man, and Spy Smasher, but placed himself in suspended animation in a chamber so that he could emerge in modern society and revive the Third Reich. He believed Hitler's body to be held in a similar chamber. Nazi's brother, scientist Wolf Krieger, and his granddaughter, a super-powered villainess named Madame Libertine who possesses mind-controlling powers, carry on Nazi's legacy in the 1990s and resurrect their hero from his suspended animation chamber in The Power of Shazam! #5.