Books on Polytheism 

Essays on a Polytheistic Philosophy of Religion by Dr. Edward Butler

A World Full of Gods: An Inquiry into Polytheism by John Michael Greer

The Deities are Many: A Polytheistic Theology by Jordan Paper

A Million and One Gods by Page duBois

Ascendant: Modern Essays on Polytheism and Theology edited by Michael Hardy

Walking With the Gods: Modern People Talk About Deities, Faith, and Recreating Ancient Traditions by W. D. Wilkerson

Sacred Gifts: Reciprocity and the Gods by Kirk Thomas

God Against the Gods: The History of the War Between Monotheism and Polytheism by Jonathan Kirsch

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Books on Pagan Theology 

Pagan Theology: Paganism as a World Religion by Michael York

Seeking the Mystery: An Introduction to Pagan Theologies by Christine Hoff Kraemer

The Path of Paganism: An Experience-Based Guide to Modern Pagan Practice by John Beckett

Paganism in Depth: A Polytheist Approach by John Beckett

Pagan and Earth-Centered Voices in Unitarian Universalism edited by Jerrie Kishpaugh Hildebrand and Shirley Ann Ranck

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Books on Hellenic Polytheism

Essays on Hellenic Theology by Dr. Edward Butler

Hellenic Polytheism: Household Worship Vol. 1 by Christos Pandion Panopoulus, Panagiotis Panagiotopoulos, and Erymanthos Armyras

Hellenismos: Practicing Greek Polytheism Today by Tony Mierzwicki

Polytheism and Society at Athens by Robert Parker

Hellenic Polytheism: A Personal Guide for Ancient Greek Practitioners by Chris Aldridge

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Books on Germanic Polytheism

The Love of Destiny: The Sacred and the Profane in Germanic Polytheism by Daniel McCoy

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Books on Gaulish Polytheism

Ancient Fire: An Introduction to Gaulish Celtic Polytheism by Segomâros Widugeni

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Books on Celtic Polytheism

The Well of Five Streams: Essays on Celtic Paganism by Erynn Laurie

Pagan Portals – Irish Paganism – Reconstructing Irish Polytheism by Morgan Daimler

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Books on Hindu Polytheism

The Myths and Gods of India: The Classic Work on Hindu Polytheism by Alain Daniélou

Loving Ganesa by Satguru Sivaya Subramuniyaswami

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Books on Egyptian Polytheism

The Ancient Egyptian Prayerbook by Tamara L. Siuda

Following the Sun: A Practical Guide to Egyptian Religion by Sharon Laborde

Circle of the Sun: Rites and Celebrations for Egyptian Pagans and Kemetics by Sharon Laborde

Eternal Egypt: Ancient Rituals for the Modern World by Richard J. Reidy

The Complete Gods and Goddesses of Ancient Egypt by Richard H. Wilkinson

Conceptions of the God in Ancient Egypt: The One and The Many by Erik Hornung

Daily Life of the Egyptian Gods by Dimitri Meeks and Christine Favard-Meeks

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Books on Abrahamic Polytheism

Twilight of the Gods: Polytheism in the Hebrew Bible by David Penchansky