Sherry vinegar is a gourmet wine vinegar made from Sherry. It is produced in the Spanish province of Cádiz and inside the triangular area between the city of Jerez de la Frontera and towns of Sanlúcar de Barrameda and El Puerto de Santa María, known as the "sherry triangle".
To be called vinagre de Jerez, by law the Sherry vinegar must undergo ageing in American oak for a minimum of six months, can only be aged within the "sherry triangle" and must have a minimum of 7 degrees acidity. Most Sherry vinegars are aged using the same solera system as the Sherry wines and Brandy de Jerez.
The production and quality of sherry vinegar is monitored and controlled by the Consejo Regulador and Sherry vinegar has its own Denominación de Origen, which is protected by Spanish and EU law. The only other vinegars with similar protected designation of origin are "Aceto Balsamico Tradizionale" from Modena and Reggio Emilia in Italy and "Condado de Huelva" in Spain.