The Microregion of Frederico Westphalen () was one of the Microregions of the Rio Grande do Sul state, in Brazil. It belonged to the mesoregion of the Noroeste Rio-Grandense. Its population was estimated by the IBGE to be of 175,391 in 2005, divided in 27 municipalities. Its total area is 5,182.529 km². The IBGE has since discontinued the microregion system for population tracking, replacing it with the term "immediate geographic region" ().

Municipalities Alpestre Ametista do Sul Caiçara Constantina Cristal do Sul Dois Irmãos das Missões Engenho Velho Erval Seco Frederico Westphalen Gramado dos Loureiros Iraí Liberato Salzano Nonoai Novo Tiradentes Novo Xingu Palmitinho Pinheirinho do Vale Planalto Rio dos Índios Rodeio Bonito Rondinha Seberi Taquaruçu do Sul Três Palmeiras Trindade do Sul Vicente Dutra Vista Alegre do Prata

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