Triceratops is an extinct genus of herbivorous ceratopsid dinosaur that first appeared during the late Maastrichtian stage of the Late Cretaceous period, about 68 million years ago in what is now North America. It is one of the last-known non-avian dinosaur genera, and became extinct in the Cretaceous–Paleogene extinction event 66 million years ago.

Bearing a large bony frill, three horns on the skull, and a large four-legged body resembling that of a rhinoceros, Triceratops is one of the most recognizable of all dinosaurs and the most well-known ceratopsid. It was also one of the largest, up to 9 meters (30 ft) long and 12 metric tons (13 short tons) in weight. It shared the landscape with and was possibly preyed upon by Tyrannosaurus, though it is less certain that two adults did battle in the fanciful manner often depicted in museum displays and popular images. The functions of the frills and three distinctive facial horns on its head have long inspired debate.

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