Galactic Milieu Series

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The Galactic Milieu Series is a series of science fiction novels by Julian May. It is linked to her previously-published series, the Saga of Pliocene Exile; and through the fantastical device of time-travel, acts as both a prequel and a sequel to this earlier series. The "Galactic Milieu" of the title is an interplanetary federation, and Earth's membership of it is a central plot concern.

It comprises four novels. Intervention covers the events leading up to Earth joining the Galactic Milieu, followed by the three books of the Galactic Milieu Trilogy – Jack the Bodiless, Diamond Mask and Magnificat – which together cover the events of Earth's membership of the Galactic Milieu.

The series involves several religious and philosophical themes, including references to the work of Pierre Teilhard de Chardin.