The Ningbo incident (Chinese: 寧波之亂; Japanese: 寧波の乱) was a 1523 brawl between trade representatives of two Senguoku Japanese daimyō clans — the Ōuchi and the Hosokawa — in the Ming Chinese southeastern coastal city of Ningbo. The Ōuchi pillaged and harmed local residents, causing massive damage. The turmoil resulted in the interruption of the Ming-Japanese trade and led to a surge in piratical (wokou) activity on the Chinese coast. The episode is also known by the names Ningbo tribute conflict (寧波争貢事件), Mingzhou incident (明州之亂, Ming zhou is an ancient name for Ningbo), or the Sōsetsu incident (宗設之亂).