Haig's tuco-tuco (Ctenomys haigi), known regionally as the Patagonian tuco-tuco, is a hystricognath rodent. Like other tuco-tucos it is and thus not often observed, although the "tuc-tuc" call of the males can be heard near burrow sites, especially in the early morning. Like most species in the genus Ctenomys, C. haigi are , with one adult per burrow.
Haig's tuco-tuco is native to Argentine Patagonia. Its primary habitat is the Patagonian steppe, but it is also found in the Low Monte and Valdivian temperate rain forest ecoregions.