Acostia is a genus of South American plants in the grass family.

[2][3][4][5] The only known species is Acostia gracilis, found only in Ecuador.

[7] The genus name of Acostia is in honour of Misael Acosta Solís (1910–1994), an Ecuadorian naturalist.

[8] The Latin specific epithet of gracilis means "slender".

[9] Both the genus and the species were first described and published in Bol.