Joan Llorenç (in Valencian; Spanish: Juan Llorens) (1458–1520) was the leader of a Germania (guild, literally "brotherhood") of Valencia.
After a series of plagues, floods, and economic disasters in Valencia, the royal government was practically nonfunctional.
However, the recently appointed Viceroy Diego Hurtado de Mendoza sided with the nobility and refused to admit the Germanies representatives.
This, and the death of the popular Guillén Castleví (known under the nickname "Sorolla") caused riots in the city that ended the royal administration.
Llorenç did not live long enough to guide the continuing revolt, as he died shortly after the riots, likely due to a heart attack.