Ptolemy of Aloros (), was sent by King Amyntas III of Macedon as an envoy to Athens c. 375–373 BC.
After Amyntas' death, he began a liaison with his widow, Eurydice.
In 368 BC, he assassinated her son, Alexander II, in order to gain control of the throne.
His actions were not well-regarded by the leading families of Macedon, who called in the Theban general, Pelopidas, to re-establish peace.
As part of the peace settlement, Philip, Alexander II's younger brother, was taken as a hostage back to Thebes.
As Alexander II's elder brother, Perdiccas III, was under-age when Alexander II was killed, Ptolemy of Aloros ruled as regent.
Ptolemy ruled as a regent for Perdiccas III until Perdiccas killed him in 365 BC.
It is suggested that Ptolemy was descended from Amyntas II's brother, Menelaus, son of Alexander I.
