The Ningbo incident (Chinese: 寧波之亂; Japanese: 寧波の乱) was a 1523 brawl between trade representatives of two Japanese daimyō clans — the Ōuchi and the Hosokawa — in the Ming Chinese 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), or the Sōsetsu incident (宗設之亂).