António Ribeiro O.F. (Évora, 1520 – Lisbon, 1591), known as O Chiado or O Poeta Chiado was a Portuguese poet.
O Chiado was a satirical poet of the sixteenth century, contemporary of Luís Vaz de Camões.He was known as Chiado for having lived many years in Chiado, Lisbon, in the street so called already in the sixteenth century (today Rua Garrett).