Espumoso is a municipality in the state of Rio Grande do Sul, in southern Brazil. It belongs to the mesoregion known as Nordeste Rio Grandense and to the microregion of Cruz Alta, which it shares with thirteen other municipalities: Alto Alegre, Boa Vista do Cadeado, Boa Vista do Incra, Campos Borges, Cruz Alta, Fortaleza dos Valos, Ibirubá, Jacuizinho, Joia, Quinze de Novembro, Saldanha Marinho, Salto do Jacuí and Santa Bárbara do Sul.
The municipality covers a total area of 783.065 km2. Its estimated population in 2020 was 15,591 inhabitants.