A coat of arms is an emblem that symbolically represents a nation, a city, a family or an association. San Antonio de los Baños has its local coat of arms, which over time has undergone transformations.
According to José Rafael Lauzán in his work ''Historia Colonial Ariguanabense'', back in the 1820s several projects of a local coat of arms were presented. In 1832, a shield with some modifications was presented, which was approved in 1858. It was oval, shaded on the left edge. On the right canton a gold tower with a red background, on the left a red rampant lion with a silver background, at the center a silver Liz flower with a blue background; down, a street of the Villa, a pig that was the symbol of the Saint Patron of San Antonio Abad, a ceiba tree and a river. A branch of coffee on the left and a branch of cane on the right. On the shield a large crown of gold and silver Spanish symbol, topped with a silver cross. From the crown came a ribbon with the legends: "City of San Antonio" and "Faithful and Constant".
The shield of San Antonio de los Baños was approved in the year 1858. Among the distinctive elements were a lion, a street of the Villa, a pig as a symbol of San Antonio Abad, a ceiba and a river. At the end of the Spain sovereignty, the exterior of the shield was modified. The Spanish crown was replaced and by a frigio cap with a solitary star, supported by a beam of bars with a blue ribbon as a symbol of the Republic and the colors of the flag. The two branches of coffee and cane were also replaced by two olive branches and the image of the town and the flower of Liz were stylized.
