Pachystruthio is a genus of extinct bird which lived in Eurasia from the Late Pliocene to the Middle Pleistocene.

[1] Its fossils have been found in Hungary, Greece[2] Crimea, Georgia, and China.

An incomplete femur from the Nihewan Formation (China) has been assigned to Pachystruthio indet.

P. dmanisensis has been estimated standing 3.5 meters (11.5 feet) tall and weighing up to 450 kg (990 lb), making it much larger than the modern ostrich and one of the largest known birds.

[1][5] Some authors have suggested placing the large (albeit smaller than P. dmanisensis) extinct ostrich species Struthio anderssoni from the Late Pleistocene of China in the genus.