In October 2014, Marvel announced a two-part sequel to Age of Ultron, titled Avengers: Infinity War. Part 1 was scheduled to be released on May 4, 2018, with Part 2 scheduled for May 3, 2019. In April 2015, Marvel announced that Anthony and Joe Russo would direct both parts of Avengers: Infinity War with back-to-back filming expected to begin in 2016 Also in the month, Kevin Feige said the films would be two, distinct films “because they [have] such shared elements, it felt appropriate… to [subtitle the films] like that. But I wouldn’t call it one story that’s cut in half. I would say it’s going to be two distinct movies.By May 2015, Christopher Markus and Stephen McFeely signed on to write the screenplays for both parts of the film.The following May, the Russos revealed that they would be retitling the two films, to further remove the misconception that the films were one large film split in two, with Joe stating, “The intention is we will change [the titles], we just haven’t come up with [them] yet. In July 2016, Marvel removed the film’s title, simply referring to it as Untitled Avengers film.Feige and the Russo brothers indicated the title was being withheld because it would give away plot details for this film and Infinity War.
Principal photography began on August 10, 2017under the working title Mary Lou 2,at Pinewood Atlanta Studios in Fayette County, Georgia, with Trent Opaloch serving as director of photography.The film, along with Infinity War, were shot using IMAX/Arri 2D cameras, thus marking the first time that a Hollywood feature film was shot entirely with IMAX digital cameras.Also in the month, filming occurred in The Gulch area of Downtown Atlanta, near the Five Points MARTA station, and Piedmont Park.Feige stated that the films were originally scheduled to be filmed simultaneously but instead decided to shoot them back-to-back explaining, “We’re doing them one right after another. It became too complicated to cross-board them like that, and we found ourselves—again, something would always pay the price. We wanted to be able to focus and shoot one movie and then focus and shoot another movie.Anthony Russo originally felt it made more sense to shoot the films simultaneously due to financial and logistical reasons considering the large number of cast members, even though each part is its own distinct film and suggested that “some days we’ll be shooting the first movie and some days we’ll be shooting the second movie. Just jumping back and forth.”Production wrapped on January 11, 2018,although additional filming took place in Dutchess and Ulster counties in New York in June 2018 Reshoots began by September 7, 2018 and concluded on October 12, 2018.More reshoots occurred in January 2019.Evans and Hemsworth both earned $15 million for the film.