An Astronic federation, which may also be known as an Astronic association, is a collection of organisations, institutions, and groups either of a religious or philosophical slant that all identify, either wholly or partly, in some way through practices and beliefs with Astronic religions, the principal one of which is Astronism.

An Astronic federation is not to be confused with a national or subnational branch of The Institution of The Philosophy of Millettism. Astronic federations are not managed in any way by The Institution, although The Institution, as the authoritative representative of Astronism, remains the founding member of all Astronic federations due to the fact that the Astronic federations were created by The Institution's founder, Cometan.

An Astronic federation therefore doesn't only represent groups and organisations associated and adhered to Astronism, but instead represents a wider religious grouping that exists in parallel to the term, Astronic religions.