Pydna (in Greek old Πύδνα/ Púdna ) is a Greek city of the ancient Macedonia, most important of Piérie.

It belongs already to the Royaume of Macedonia under Alexandre I {{er}} (Thucydide I, 137,1), finds then its independence, is besieged by the Athéniens in 432 av. J. - C., to be again subjected by Archélaos in 410 av. J. - C.: this one moves the population of 20 Stade S towards the interior of the grounds for there refonder the city (Diodore of Sicily 13.14). The Athenians seize them in 364 av. J. - C. then Philippe II of Macedonia takes it in 356 av. J. - C. in spite of the secret agreement which bound it to Athens. In 317 av. J. - C., the city is besieged and taken by Cassandre which made there put at dead the queen-mother Olympias.

It is with the Bataille of Pydna that is played the fate of the kingdom antigonide of Macedonia: June 22nd 168 av. J. - C., the last king, Persée east demolishes there by the Roman general Paul Emile.

A tomb Macedonian discovered and was explored there by L. Heuzey at the time of its famous archaeological mission in 1867.

The site of the city is discussed but could correspond, according to indices epigraphic agreeing with the Byzantine tradition, at the village of Kytros rather than to that of Alonia.