Loki Laufeyson is a character appearing in American comic books published by Marvel Comics. Created by writer Stan Lee, scripter Larry Lieber, and penciller Jack Kirby, he is based on the Norse mythological deity of the same name. Although a version of Loki first appeared in Venus #6, his characterization as the adoptive brother and nemesis of the superhero Thor, which has persisted to the modern age, was not introduced until Journey into Mystery #85.

Marvel Comics is an American comic book publisher and the property of The Walt Disney Company since December 31, 2009, and a subsidiary of Disney Publishing Worldwide since March 2023. Marvel was founded in 1939 by Martin Goodman as Timely Comics, and by 1951 had generally become known as Atlas Comics. The Marvel era began in August 1961 with the launch of The Fantastic Four and other superhero titles created by Stan Lee, Jack Kirby, Steve Ditko, and many others. The Marvel brand, which had been used over the years and decades, was solidified as the company's primary brand.