There is a fan-made “trailer” online titled The Hangover 4 (2025) — but it’s not from Warner Bros. or the original filmmakers.
Conclusion / My Best Interpretation
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There is no real Hangover 4, at least as of the most reliable public information.
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The original trilogy is generally considered complete.
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Rumors or fan content exist, but they’re not backed by announcements from the studio or confirmed production.
