Jamie Foxx‘s annual Halloween party held at his sprawling Thousand Oaks mansion took a violent turn Saturday night when a stabbing took place … TMZ has learned.

Law enforcement sources tell TMZ … deputies and paramedics responded to a party at Jamie’s house.

A male — who was stabbed in the neck — suffered a superficial wound and was treated by paramedics at the scene.

In a chaotic video taken outside the party — which is organized by Jamie’s daughter Anelise — multiple individuals can be seen in cuffs as hundreds of costumed attendees are directed off the premises.

In a pic from the scene … a sign clearly states a “No Real or Fake Weapons” rule.

Sources tell us … deputies ended up arresting a male suspect for assault with a deadly weapon.