Hypochaeris chillensis (sometimes spelled Hypochoeris) also known as Brazilian cat's ear is a species of flowering plant in the family Asteraceae. It is native to South America (Argentina, Bolivia, Chile, Paraguay, Brazil, Uruguay) but has become naturalized in parts of North America, South Africa. and Taiwan. It is a common and widespread weed in the Southeast United States.

Hypochaeris chillensis is a perennial herb growing a taproot, a basal rosette of leaves, and one or more thin stems 20–60 centimetres (7.9–23.6 in) tall. The leaves are 5–25 centimetres (2.0–9.8 in) long, entire or lobed, and green. Atop the thin, naked stems are flower heads with small golden yellow ray florets, typically 1 centimetre (0.39 in) in diameter.