Men in Black: International (stylized as MIB: International in promotional material) is a 2019 American science fiction action comedy film directed by F. Gary Gray and written by the writing team of Art Marcum and Matt Holloway. It is the fourth installment in the Men in Black film series, serving as a stand-alone sequel set in the same universe as the previous films, but is the first film in the series to not feature Will Smith or Tommy Lee Jones as the main characters.

It stars Chris Hemsworth, Tessa Thompson, Kumail Nanjiani, Rebecca Ferguson, Rafe Spall, Laurent and Larry Bourgeois, and Liam Neeson. Emma Thompson reprises her role from the third film, while Tim Blaney returns to voice Frank the Pug from the first two installments. The film follows the Men in Black taking on its biggest threat: a mole in the agency.

Talks of a fourth Men in Black film began after the release of Men in Black 3 in 2012. In February 2018, Hemsworth signed on to lead a spin-off, Gray was hired to direct, and Thompson joined the cast the following month. Filming took place in New York City, Morocco, Italy and London from July to October 2018. Danny Elfman, who had scored the previous three installments, returned to compose the reboot with Chris Bacon.

Men in Black: International was produced by Columbia Pictures in association with Tencent Pictures, Amblin Entertainment, and Parkes+MacDonald Image Nation, and distributed by Sony Pictures Releasing, it is loosely based on the Malibu/Marvel comic book series of the same name by Lowell Cunningham, and was theatrically released in the United States on June 14, 2019.

In 1996 Brooklyn, Molly Wright witnesses her parents being neuralyzed by agents of Men in Black after they see an alien in their home. Molly helps the alien escape, avoiding neuralyzation herself. Twenty-three years later, rejected from government agencies due to her "delusions" regarding alien life, Molly tracks down an alien landing and follows MIB agents to their headquarters in New York City. Caught entering the agency, Molly makes an impression on Agent O after revealing she had bypassed neuralyzation, arguing that her obsessive search for them makes her 'perfect' for the job and she has no life outside her search for the agency. She is awarded probationary agent status as "Agent M" and assigned to the organization's London branch.

There, M meets High T, head of the London branch, and Agent H. M learns that H and T fought off an invasion of the Hive, a parasitic race who invade planets by merging with the DNA of the conquered species, at the Eiffel Tower in 2016, using a wormhole included in the original migration to Earth. H has since become unconcerned with his duties and only keeping his job due to High T covering for him. M arranges for herself to be assigned to assist H in his meeting with alien royalty Vungus the Ugly, H's close friend.

During their night out with Vungus, they are accosted by mysterious alien Twins able to manifest as pure energy. The Twins fatally injure Vungus, who gives M a strange crystal before he dies, claiming that H has changed since they last met and cannot be trusted. M points out that few people knew Vungus' location, and he was likely betrayed by one of the agents present when High T assigned H to guard him. Nervous at the possibility of a traitor within MiB, High T assigns Agents C and M to investigate while H is demoted to desk duty, with evidence suggesting that the Twins had DNA traces of the Hive.

H convinces M to join him in following a lead to Marrakesh, where they recover "Pawny", the last survivor of a small group of aliens attacked by the Twins. Pawny pledges loyalty to M, and they are trapped by MiB agents coordinated by C, who recovered video footage of Vungus passing the crystal to M and believes she is the traitor. With the aid of alien contacts Nasr and Bassam, H escapes with M and Pawny on a rocket-powered bike, and they learn that Vungus' crystal is a weapon powered by a compressed blue giant. As they repair the damaged bike, Bassam steals the weapon and takes it to H's ex girlfriend Riza Stavros, an alien arms dealer. Traveling to Riza's island fortress, the trio attempts to infiltrate the base, but is caught by Riza and her bodyguard Luca Brasi. Luca, the alien M rescued as a child, returns the favor by allowing them to leave with the weapon while he keeps Riza contained. The three are cornered by the Twins, who are killed by High T and a group of agents.