The Cerretani or Ceretani were ancient pre-Roman people of the Iberian Peninsula who occupied what became the modern-day Cerdanya, in the valley Segre and part of Aragon. Their neighbours from the east were Ausetani and from the south Ilergetes. Their capital was Julia libyca, modern Llívia. They are noted in Greek and Roman geographical treatises.
- "Spain", Encyclopaedia Britannica (5 ed.), 1815, p. 492
- Peter Sahlins (1989), Boundaries: The Making of France and Spain in the Pyrenees, University of California Press, pp. 44–45, 61–62