Celtic mythology

Celtic mythology is the mythology of Celtic polytheism, apparently the religion of the Iron Age Celts. Like other Iron Age Europeans, the early Celts maintained a polytheistic mythology and religious structure. Among Celtic peoples in close contact with Rome, such as the Gauls and Celtiberians, their mythology did not survive the Roman empire, their subsequent conversion to Christianity, and the loss of their Celtic languages. Ironically, it is through contemporary Roman and Christian sources that what we do know of their beliefs has come down to us. However, those Celtic peoples who maintained either their political or linguistic identities (such as the Gaels and Brythonic tribes of the British Isles) did transmit at least vestigial remnants of the mythologies of their Iron Age forebears, which were often recorded in written form during the Middle Ages.
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All the articles available in the Celtic mythology section of the Encyclopedia Mythica:
Abandinus; Abarta; Abellio; Abhean; Abnoba; Achall; Achtan; Achtland; Adsullata; Aengus; Aericura; Aes Sidhe; Aeval; Agrona; Ai; Aibell; Aillen; Aimend; Ain; Aine; Airitech; Airmed; Alaunus; Albiorix; Alisanos; Amaethon; Ambisagrus; Anann; Ancamna; Andarta; Andraste; Anextiomarus; Anne, St.; Annwn; Anu; Arawn; Arduinna; Arianrhod; Arnemetia; Artio; Arvernus; Aufaniae; Avalloc; Aveta; Badb; Balor; Banba; Beag; Bebhionn; Belatu-Cadros; Belenus; Belisama; Berecyntia; Bile; Blodeuwedd; Boann; Bodb; Bodb Dearg; Borvo; Bran; Branwen; Branwen; Brea; Breg; Bres; Bride; Brigantia; Brigid; Brigindo; Britannia; Bronach; Bussumarus; Caer; Cailleach; Camma; Camulus; Canola; Carman; Cartimandua; Caswallawn; Cenn Cruaich; Ceridwen; Cernunnos; Cessair; Cethlion; Cliodhna; Clota; Cocidius; Conall Cernach; Conchobar; Condatis; Conn; Contrebis; Corb; Cormac Mac Airt; Coventina; Creiddylad; Creidhne; Crom Cruach; Cu Roi; Cuchulainn; Curoi mac Daire; Cwn Annwn; Cyhiraeth; Dagda; Damara; Damona; Danu; Dea Matrona; Dea Sequana; Dechtere; Deirdre; Dewi; Dia Griene; Dian Cecht; Dis; Don; Dwyn; Dylan; Edain; Elen; Eloi, St.; Emer; Epona; Eri; Eriu; Esus; Etain; Ethne; Fagus; Fand; Ferdiad; Fergus; Fergus mac Roich; Fianna; Finn Mac Cumhail; Fionnuala; Firbolg; Fodla; Fomorians; Gae Bulg; Goibniu; Govannon; Grannus; Gwenn Teir Bronn; Gwydion; Gwynn ap Nudd; Hafgan; Hervé, St.; Hooded Spirits; Icaunus; Inghean Bhuidhe; Lasair; Latiaran; Leucetios; Lia Fail; Llew Llaw Gyffes; Llyr; Lud; Lugh; Lugos; Luxovius; Mabon; Macha; Mag Mell; Mag Tuireadh; Manannan mac Lir; Manawydan; Mannan; Maponos; Math Mathonwy; Matres; Midir; Milesians; Modron; Mog Ruith; Morrigan; Murigen; Nantosuelta; Nantosuetta; Nemausus; Nemetona; Niamh; Nisien and Efnisien; Nodens; Nuada; Oengus Mac Oc; Ogma; Ogmios; Ogyruan; Olwen; Plur na mBan; Pryderi; Pwyll; Rhiannon; Robur; Rosmerta; Rudianos; Sabrina; Samhain; Saone; Scathach; Segomo; Sequanna; Shannon; Sheila-na-gig; Shoney; Sirona; Smertios; Sucellos; Sul; Tailtiu; Taliesin; Tamesis; Taranis; Tarvos Trigaranos; Tethra; Teutates; Tir na n-Og; Tuatha Dé Danann; Twm Shon Catti; Verbeia; Vosegus; Wild Hunt; Yonne.