X-Men Movies: Story Timeline
This story timeline attempts to present the X-Men saga in chronological order, though viewers should be prepared for significant continuity issues and timeline contradictions. Days of Future Past creates alternate timelines, while various prequels and sequels don't always align perfectly with established continuity.
This watch order provides the most comprehensive narrative experience despite its complexities, beginning with Charles Xavier and Erik Lehnsherr's first meeting in the 1960s and following the mutant struggle through to Logan's final story in 2029. The timeline requires accepting some inconsistencies due to the franchise's time travel elements and evolving continuity. Note that The New Mutants is excluded from this order due to its minimal connection to the main storyline.
There are 3 other watch orders available - see the links up above.

X-Men: First Class
A prequel exploring the origins of Charles Xavier and Erik Lensherr, two young mutants who start as close friends before becoming the iconic adversaries Professor X and Magneto. Together with other mutants, they must unite to face a global threat that will ultimately drive them apart.
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X-Men: Days of Future Past
The X-Men must send one of their own back in time to change a pivotal moment in history in order to prevent a catastrophic future where mutants face extinction.
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X-Men Origins: Wolverine
Logan undergoes the experimental Weapon X program to become the indestructible Wolverine while seeking revenge for his girlfriend's death.
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X-Men: Apocalypse
When the ancient and powerful mutant Apocalypse awakens after thousands of years, the X-Men must band together to stop his plan to destroy and remake the world.
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Dark Phoenix
When Jean Grey is exposed to a mysterious cosmic force during a space rescue mission, she becomes incredibly powerful but dangerously unstable. The X-Men must unite to save their teammate while facing an alien threat that seeks to exploit Jean's newfound abilities.
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X-Men
When two mutants arrive at a school for gifted youngsters, they become involved with the X-Men, a team of superhero mutants who must stop a terrorist organization led by the villainous Magneto.
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X2
Professor Xavier and his X-Men must join forces with their usual enemies Magneto and Mystique to stop Colonel Stryker's dangerous anti-mutant campaign. The team faces their greatest challenge yet as rising tensions between humans and mutants reach a breaking point.
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X-Men: The Last Stand
When a cure for mutations is discovered, the X-Men and Magneto's Brotherhood find themselves on opposite sides of a conflict that will determine the future of mutant-kind.
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The Wolverine
Wolverine travels to modern-day Japan where he faces his ultimate nemesis and confronts tests that challenge his physical, emotional, and mortal limits.
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Deadpool
Former Special Forces operative Wade Wilson becomes the wisecracking, fourth-wall-breaking antihero Deadpool after a rogue experiment gives him accelerated healing powers. Armed with his newfound abilities and twisted sense of humor, he seeks revenge against those who nearly destroyed his life.
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Deadpool 2
Wisecracking mercenary Deadpool must protect a young mutant from the time-traveling soldier Cable while assembling his own team of unlikely heroes.
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Deadpool & Wolverine
A retired Wade Wilson must reluctantly return as Deadpool and team up with an unwilling Wolverine to save his homeworld from an existential threat.
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Logan
In the near future, an aging Logan cares for Professor X while trying to stay hidden, but their quiet existence is disrupted when a young mutant seeks their help while being hunted by dangerous forces.
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