The Battle of Puerto de Baños (12 August 1809) saw a Portuguese-Spanish column led by Robert Wilson attempt to defend a mountain pass against Marshal Michel Ney's VI Corps.

Baños de Montemayor is located about 45 kilometres (28 mi) northeast of Plasencia, Spain.

However, the threat of Marshal Nicolas Soult's large army to the north soon forced Wellesley and Cuesta to withdraw to the west.

At Puerto de Baños, Wilson found Ney's corps marching north to cross the pass and decided to fight.

After a skillful defense, Wilson's troops were finally defeated, but they escaped into Portugal without further incident.