The International Plato Society encourages the study of Plato, publishes books on Plato, and organizes the Platonic Symposia. A Plato Bibliography (a list of editions and translations of Plato's works, and a list of titles of studies on Plato and his works) for years 2000-2010 is available as well.

This association was established in 1926 and focuses on the classical sources and the Catholic Philosophical heritage. The website for ACAP has information regarding the annual meeting and useful philosophy links.

This association focuses on the study of Greek Philosophy.