Ernestina may refer to:
People
Ernestina Cravello (1880–1942), Italian-American anarcha-feminist Clodoaldo de Oliveira, a Brazilian footballer Ernestina Edem Appiah, a Ghanaian social entrepreneur Ernestina Herrera de Noble (1925–2017), Argentine publisher and executive Ernestina A. López (1879–1965), Argentine educator and women's rights activist Ernestina "Titina" Silá (1943-1973) Bissau-Guinean revolutionary
Places
Ernestina, Rio Grande do Sul, a municipality in Brazil Santa Ernestina, a municipality in Brazil Ernestina, Queensland, a former rural locality in Queensland, Australia, now amalgamated into the locality of Longreach Ernestina, Buenos Aires, a town in Argentina
Other
Effie M. Morrissey, a schooner now known as Ernestina