Top 10 Online Resources for Learning About Irish and Celtic Mythology

image of Celtic stone circle

With so many websites, blogs, and books dedicated to Irish and Celtic mythology now available to us thanks to the wonders of the internet, it can be hard to separate the signal from the noise, the wheat from the chaff, the peat from the bog.

Idioms aside, information overload is a real problem when learning about Irish and Celtic mythology, as it is in all disciplines.

In our pursuit of knowledge about ancient Irish and Celtic gods, monsters, and heroes, and their associated myths, legends, and folktales, we want to make sure what we’re learning is accurate, thorough, well-researched, and, ideally, well-written. And that’s exactly why I put together this list of Irish and Celtic mythology resources.

The 10 Best Free Irish Mythology and Celtic Mythology Resources

While not exhaustive by any means, this list of free online resources should, hopefully, appeal to all Irish and Celtic myth aficionados, amateurs and experts alike (and everyone in between).

From introductory posts that offer general overviews of Irish and Celtic mythology (think “Celtic Mythology 101”), to more in-depth, nuanced pieces that explore specific stories and characters in greater detail, chances are there’ll be something here that can help you on your journey.

1) Lewis & Clark College: “Once Upon a Time, Irish Mythology Crash Course”

In this blog post from the Lewis & Clark College website, student Max Usman shares some of the key Irish mythology facts he learned while doing research for his Irish Life & Cultures class. The post gives a great high-level overview of the four cycles of Irish mythology: the Mythological Cycle, the Ulster Cycle, the Fenian Cycle (also known as the Ossianic Cycle), and the King Cycle / Cycle of Kings (also known as the Historical Cycle).


2) Claddagh Design: “A Quick Guide to Irish Mythology”

This quick-hitting guide from the Claddagh Design blog presents a ton of valuable information and insight about Irish mythology and Celtic history. In addition to covering the four cycles (mentioned above), the guide explores the Celtic origins of Irish mythology, explaining how the oral traditions of warrior-farmers from the Alps would eventually leave mainland Europe and reach the Emerald Isle, where they’d be written down and preserved for generations to come.


3) Maricopa Community Colleges: “Irish Myths and Legends”

Ready to dive deeper into the specific battles, adventures, voyages, cattle-raids, romances, pursuits, and tragedies of Irish mythology? This portal from the Maricopa Community Colleges website has got you covered. From “The Landing of the Gael” and “The Battle of Tailltin” (Mythological Cycle), to “The Pursuit of Diarmuid and Grainne” and “The Cattle-Raid of Cooley / Táin Bó Cúalnge” (Ulster Cycle), to “The Fate of the Children of Lir” and “The Wooing of Etain” (Fenian Cycle), links to many of the most well-known Irish myths, legends, and folktales are included here.


4) Mythopedia: “Celtic Mythology”

Easily the most beautifully designed resource on the list, Mythopedia’s page on Celtic mythology is well worth a few minutes (or hours) of perusing. Come for the user-friendly layout and eye-catching graphics, stay for the meticulously researched biographies of Celtic gods, including the horned god Cernunnos (god of beasts and  wild places) and the triple goddess The Morrígan (goddess of death and battle).


5) Encyclopedia Britannica: “Celtic Religion: The Celtic Gods”

Yes, I’ve decided to include an entry from the good ole Encyclopedia Britannica on this list, and for good reason: It provides a detailed look at when the Celtic gods of ancient Gaul first appeared in the historical record. Spoiler alert: It was in 52–51 BCE, when Julius Caesar made note of five Celtic gods and their functions. Granted, he used the names of Roman gods rather than their native names. For example, Caesar equated the Roman god Mercury with the Celtic god Lugus, who has cognates in Irish mythology (Lugh) and Welsh mythology (Lleu).

Fun fact: Many place names throughout Europe derive their name from Lugh, including the French cities of Lyon, Laon, and Loudun; the Dutch city of Leiden; the Polish city of Legnica; and a little foggy town in England called London (Lugdunum).

Another fun fact: As the centuries passed and belief in Celtic deities waned, Lugh’s importance was diminished and he became known as “little stooping Lugh” or Lugh-chromain (anglicized as “Leprechaun”).


6) Realm of History: “15 Ancient Celtic Gods and Goddesses You Should Know About”

Here’s another resource that delves into the pre-Christian, Celtic/Gaulish origins of the gods and goddesses that now permeate Irish mythology, and how they were influenced by the Romanization of Western Europe. This thoroughly researched listicle from the Realm of History blog highlights fifteen of the most important ancient Celtic deities, including Belenus (“the effulgent sun god”), Toutatis (“the guardian god of Gauls”), Taranis ( god of thunder), Ogmios/Ogma (god of eloquence), and Epona (“the protector goddess of horses”).


7) ThoughtCo: “Irish Mythology: History and Legacy”

This neatly organized introduction to Irish mythology, written by McKenzie Perkins for the ThoughtCo blog, provides concise answers to broad questions such as “What is Irish Mythology?” and “Who were the most important Irish mythical deities?” The post also highlights the crucial role Irish Christian monks played in shaping, flavoring, and, most importantly, recording Irish myths, which, until the 11th century, had existed primarily as an oral tradition. 


8) Illinois Central College Library: “Ancient Civilizations: Celtic Mythology”

Here we have what can best be described as a mini-dictionary of Irish and Celtic mythology. In addition to providing brief biographies of gods and heroes, including Cormac mac Art, Cú Chulainn, and Finn mac Cumhaill, this free resource from the Illinois Central College Library defines key concepts from Irish mythology, including geis (“a magical obligation superseding all other laws and moral imperatives”) and sidhe (“the inhabitants of the fairy Otherworld, who in Irish folklore have frequent congress with mortal man.”)

Fun fact: The banshee from Irish folklore—the female spirit whose haunting shrieks warn of impending death—derives her name from bean sídhe: “woman of the fairies.”


9) University of Pittsburgh: “Folklore, Folktales, and Fairy Tales from Ireland”

This digital library assembled by the University of Pittsburgh’s D. L. Ashliman is the most comprehensive collection of digitized books about Irish myths, legends, folktales, and fairytales on the internet. Period. Examples of the books you can find here (all available via Google Books) include Jeremiah Curtin’s Myths and Folk-Lore of Ireland (1895), Douglas Hyde’s Beside the Fire: A Collection of Irish Gaelic Folk Stories (1890), Joseph Jacobs’s Celtic Fairy Tales (1892), and James Stephens’s Irish Fairy Tales (1920).


10) University of North Carolina School of Information and Library Science: “Irish Folklore and Mythology: A Pathfinder”

Looking for more modern books on Irish mythology? Check out this online pathfinder from the University of North Carolina. While not all of the books and resources listed here are digitized, this pathfinder can help guide you in your research. The “Dictionaries and Encyclopedias” section is especially useful, highlighting Irish and Celtic reference materials such as Daragh Smyth’s Guide to Irish Mythology (1996), Dáithí Ó hÓgáin’s Myth, Legend and Romance: An Encyclopedia of the Irish Folk Tradition, and Peter Berresford Ellis’s Dictionary of Celtic Mythology (1992). LINKS TO THESE BOOKS BELOW!


So there you have it, the ten best free Irish and Celtic mythology resources you can find online. And to reiterate what I wrote in the introduction, this list is by no means comprehensive. If you know of a blog, website, book, or guide to Irish or Celtic mythology that should be on this list, don’t hesitate to send it my way. 


Further Reading

From the Blog

From the Bookshelf

FYI: Irish Myths is reader-supported. When you buy through links on our site, we may earn a small affiliate commission.

Myth, Legend, and Romance: An Encyclopaedia of Irish Folk Tradition

Per the publisher: “Examines the folk tradition of Ireland, covering the hagiography, folk tales, and customs of the land, and includes a short introduction to Gaelic and a pronunciation guide…The works of Joseph Campbell, his highly acclaimed PBS interview with Bill Moyers, and the steadily expanding awareness of and interest in Jungian psychology have all contributed to an explosion in demand for scholarly yet accessible works on mythology and folklore. This first volume in a series on world mythologies will claim a place in the first ranks of the literature of lore. 100 illustrations.” Learn more…


A Guide to Irish Mythology

Per the publisher: “This guide, structured alphabetically with a helpful cross-reference system, allows the reader to delve into the ornate world of Irish mythology and its four cycles of tales: the Mythological Cycle, the Ulster Cycle, the Fenian or Ossianic Cycle, and the Historical Cycle or Cycle of Kings. The characters associated with each of these cycles are vividly brought to life – heroes such as Cúchulainn, Ossian, Cormac mac Airt, Conchobar mac Nessa, Finn and the Fianna.” Learn more…


Dictionary of Celtic Mythology (Oxford Reference)

Per the publisher: “The Celts were one of the great founding civilizations of Europe and the first North European people to emerge into recorded history, producing a vibrant labyrinth of mythological tales and sagas that have influenced the literary traditions of Europe and the world. The first A-Z reference of its kind, Dictionary of Celtic Mythology is fascinating and accessible guide to the gods and goddesses, the heroes and heroines, the magical weapons, fabulous beasts, and otherworld entities that populate the myths of this rich European culture.” Learn more…


From the Altar

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