Sertaneja and Sertanejo are Brazilian terms that may refer to: Sertanejo, a resident of the Sertão (equivalent to a United States cowboy in frontier times) Sertaneja, Paraná, a municipality in Paraná, Brazil Sertanejo music, a musical genre in Brazil (known as Sertanejo) O sertanejo, a novel by the Brazilian writer José de Alencar Viola sertaneja, a stringed musical instrument from North-eastern Brazil Sertanejo, nickname of Felipe Arantes, Brazilian mixed martial artist