In the 1911 Encyclopædia Britannica:
- Apollonius the Effeminate, a 2nd-century B.C. rhetorician at Rhodes, teacher of Marc Antony
- Apollonius Molon, a 1st-century B.C. rhetorician and anti-Semite at Rhodes, teacher of Cicero and Julius Caesar
- Apollonius of Perga or Apollonius Pergaeus, a 3rd-century B.C. astronomer and geometer at Alexandria
- Apollonius of Rhodes or Apollonius Rhodius, a 3rd- and 2nd-century B.C. poet at Alexandria and grammarian at Rhodes, author of the Argonautica
- Apollonius the Sophist, a 1st-century grammarian and lexicographer at Alexandria
- Apollonius the Surly, a 2nd-century grammarian at Alexandria
- Apollonius of Tralles, a 2nd-century B.C. sculptor, creator of the Farnese Bull
- Apollonius of Tyana, a 1st-century Neo-Pythagorean philosopher and traveller
- Apollonius of Tyre, a medieval tale supposed to derive from a lost Greek original