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Gastornis, formerly known as Diatryma, is an extinct genus of large flightless birds. They lived in the late Paleocene and early Eocene epochs of the Cainozoic. The first remains were discovered in the mid-19th century.

In the 1870s, the famous American paleontologist Edward Drinker Cope discovered another, more complete set of fossils in North America, and named them Diatryma.

The fossil remains of these birds have been found in western-central Europe (England, Belgium, France and Germany) as well as North America. Their life style is in dispute.