Apollonius (Ancient Greek: Άπολλώνιος) was a man of the Seleucid Empire who lived in the 2nd century BCE.
Apollonius was a friend of the Seleucid ruler Demetrius I Soter when the latter was a young man.
When Demetrius, at the age of 10, was sent to Rome as a hostage in 175, Apollonius went with him, and supported him with his advice.
Apollonius had been educated together with Demetrius, and their two families had been long connected by friendship.
[1] He is mentioned in 2 Maccabees 3 as the person who informed Seleucus of the great wealth held at the temple in Jerusalem.