埃尔瓦尔（葡萄牙语：Herval）是巴西南大河州的一个市镇。总面积1758.412平方公里，总人口6873人，人口密度3.9人/平方公里。

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Herval is a Brazilian municipality in the southern part of the state of Rio Grande do Sul. The population is 6,975 (2015 est.) in an area of 1757.84 km². Its elevation is 287 m. Its main industry is agriculture.

Herval is situated south of the Piratini River, which was defined in 1777 as the border between the Spanish and Portuguese possessions. The current border between Uruguay and Brazil lies further south, at the Jaguarão River.