The Mutiny of the Trout (Spanish: Motín de la Trucha) was a semi-legendary popular revolt in Zamora, Spain, in late 1157.
The steward of Gómez Álvarez de Vizcaya, the town governor or regidor, tried to requisition an especially fine-looking trout from a local fishmonger who had already promised to sell it to the shoemaker.
Some local knights, including the eldest son (unnamed in the sources) of Count Ponce Giraldo de Cabrera, then governor of Zamora, convened in the church of Santa María to discuss the proper course of action, the rioters locked them in and set the church alight, burning to death all inside.
One commentator has seen in the story "notable indications of its veracity" (no desdeñables indicios de su veracidad), but it is not widely accepted by historians.
The exile of Ponce de Cabrera is also a historical fact, but no source other than the Mutiny story provides a reason for it.