Project X Haren was an event that started out as a public invitation to a birthday party by a girl on Facebook, but ended up as a gathering of tens of thousands of youths causing riots on 21 September 2012 in the town of Haren, Groningen, Netherlands.
The event was unprecedented in the Netherlands, but in June 2011, a German girl had posted similar birthday invitations on the internet. Hundreds of mostly drunk youths gathered in Hamburg, Germany, causing a great deal of damage and rioting against the police.
In 2025, the events inspired a Netflix documentary called Trainwreck: The Real Project X.
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