"Delenda Est" is a science fiction short story by American writer Poul Anderson, part of his Time Patrol series.

At the time of the story, Britain (Brittys), Ireland, France (Gallia) and Spain (Celtan) are under Celtic control, and the Celts have also colonized North America (Affalon).

The major global powers are Hinduraj, which is centered on India but also encompasses Southeast Asia, Indonesia, New Guinea and Australasia, and Huy Braseal, which controls much of South America.

Manse Everard, a 20th-century Time Patrol agent, finds himself in the new timeline, in Catavellaunan (approximately New York), facing the moral dilemma.

Conversely, Barnes assumes that the victorious Carthaginians would have succeeded in creating a world empire, an extremely cruel, aggressive and oppressive one, which is the undoubted villain of his books.