Gaulish and Brythonic deities

The Gaulish Celts inhabited the region corresponding to modern-day France, southern and western Germany, Belgium, Frisia, Netherlands, Holland, Luxembourg and northern Italy. The Brythonic Celts, or Britons, inhabited most of the island of Great Britain and later migrated to Brittany.
Male

    Abandinus, possibly a river-god
    Abellio (Abelio, Abelionni), god of apple trees
    Alaunus (Fin), god of healing and prophecy
    Alisanos (Alisaunus)
    Ambisagrus, a god of thunder and lightning, Ancestor God, Sky God, God of Wind, Rain & Hail
    Anextiomarus (Anextlomarus, Anextlomara), a protector god
    Ankou, a god of death
    Atepomarus, a horse god
    Arvernus, a tribal god
    Arausio, a god of water
    Barinthus (Manannán mac Lir), a god of the sea and water
    Belatucadros, a god of war
    Belenus, a god of healing.
    Borvo (Bormo, Bormanus), a god of mineral and hot springs
    Borrum, a god of the winds.
    Buxenus, a god of box trees
    Camulus (Camulus, Camalos), a god of war and sky
    Canetonnessis
    Cernunnos horned God or God of fertility, life, animals, wealth and the underworld.
    Cicolluis god of Celtic army
    Cimbrianus
    Cissonius (Cisonius, Cesonius), a god of trade
    Mars Cnabetius, a god of war[1]
    Cocidius, a god of war
    Condatis, a god of the confluences of rivers
    Contrebis (Contrebis, Contrebus), a god of a city
    Dii Casses god of refuse
    Dis Pater (Dispater), a god of the underworld
    Esus (Hesus)(possibly) the God of vegatation
    Fagus, a god of beech trees
    Genii Cucullati, Hooded Spirits
    Grannus, a god of healing and mineral springs
    Intarabus
    Iovantucarus, a protector of youth
    Latobius[2]
    Lenus, a healing god
    Leucetios (Leucetius), a god of thunder
    Lugus, creation and learning
    Luxovius (Luxovius), a god of a city's water
    Maponos (Maponus), a god of youth
    Mogons (Moguns)
    Moritasgus, a healing badger god
    Mullo
    Nemausus, a god worshipped at Nîmes
    Nerius
    Nodens (Nudens, Nodons), a god of healing, the sea, hunting and dogs
    Ogmios
    Robor, a god of oak trees
    Rudianos, a god of war
    Sedatus[2]
    Segomo, a god of war
    Smertrios (Smertios, Smertrius), a god of war
    Sucellus (Sucellos), a god of nature
    Taranis, a god of thunder
    Toutatis (Caturix, Teutates), a tribal god
    Tridamos bovine triplication and abundance
    Veteris (Vitiris, Vheteris, Huetiris, Hueteris)
    Virotutis
    Visucius
    Vindonnus, a hunting and healing god
    Vinotonus
    Vosegus, a god of the Vosges Mountains

Female

    Abnoba, a goddess of rivers and forests
    Adsullata, goddess of the River Savubalabada
    Aericura
    Agrona, a goddess of war
    Ancamna, a water goddess
    Ancasta, goddess of the River Itchen
    Andarta, a goddess of war
    Andraste, goddess of victory
    Arduinna, goddess of the Ardennes Forest
    Aufaniae
    Arnemetia, a water goddess
    Artio, goddess of the bear
    Aventia
    Aveta, a mother goddess, associated with the fresh-water spring at Trier, in what is now Germany
    Belisama, a goddess of lakes and rivers, fire, crafts and light, consort of the god Belenus
    Brigantia
    Britannia, originally a personification of the island, later made into a goddess
    Campestres
    Clota, patron goddess of the River Clyde
    Coventina, goddess of wells and springs
    Damara, a fertility goddess
    Damona, consort of Apollo Borvo and of Apollo Moritasgus
    Dea Matrona, "divine mother goddess" and goddess of the River Marne in Gaul
    Dea Sequana, goddess of the River Seine
    Debranua, a goddess of speed and fat
    Epona, fertility goddess, protector of horses, donkeys, and mules
    Erecura, earth goddess
    Icaunus, a goddess of a river
    Icovellauna, a water goddess
    Litavis
    Mairiae
    Nantosuelta, goddess of nature, the earth, fire, and fertility in Gaul
    Nemetona
    Ritona (Pritona), goddess of fjords
    Rosmerta, goddess of fertility and abundance
    Sabrina, goddess of the River Severn
    Senua
    Sequana, goddess of the River Seine
    Sirona, goddess of healing and fertility
    Suleviae, a triune version of Sulis
    Sulis, a solar nourishing, life-giving goddess and an agent of curses
    Tamesisaddas, goddess of the River Thames
    Verbeia, goddess of the River Wharfe

Welsh deities/characters

The Welsh are the Britons that inhabit modern-day Wales (Welsh: Cymru). After the Anglo-Saxons invaded Britain, many Brythonic territories came under Anglo-Saxon influence; in Wales, however, Brythonic Celtic religion was largely retained. Many Welsh myths were later Christianized so it is sometimes difficult to determine if their characters were originally gods, mortals, or historical figures.
Male

    Aeron - god of war
    Amaethon - god of agriculture
    Arawn - king of the otherworld realm of Annwn
    Afallach - descendant of Beli Mawr and father of Mabon ap Modron
    Beli Mawr - ancestor deity
    Bendigeidfran - giant and king of Britain
    Culhwch
    Dwyfan
    Dylan Ail Don
    Euroswydd
    Gofannon
    Gwydion
    Gwyddno Garanhir
    Gwyn ap Nudd
    Hafgan
    Lleu Llaw Gyffes
    Lludd Llaw Eraint
    Llŷr
    Mabon
    Manawydan
    Math fab Mathonwy
    Myrddin Wyllt
    Nisien and Efnysien (twin brothers)
    Pryderi
    Pwyll
    Taliesin
    Ysbaddaden

Female

    Arianrhow
    Blodeuwedd
    Branwen
    Ceridwen
    Cigfa
    Creiddyla
    Cyhyraeth
    Dôn
    Elen
    Habondia
    Modron, Welsh derivation of Dea Matrona, possible prototype for Morgan le Fay
    Olwen
    Penarddun
    Rhiannon

Gaelic deities
Main article: Tuatha Dé Danann

Note: Modern spellings are shown in brackets.
Male

    Abarta
    Abcán
    Abean (Abhean)
    Abgatiacus
    Aed (Aodh)
    Aengus a.k.a. Óengus (Aonghus)
    Ailill
    Alastir
    Aí (Aoi)
    Balor
    Bodb Dearg (Bodhbh Dearg)
    Brea
    Bres (Breas)
    Brian, Iuchar, and Iucharba
    Buarainech
    Cian
    Cichol a.k.a. Cíocal
    Conand (Conann)
    Corb
    Credne (Creidhne)
    Crom Cruach
    Crom Dubh
    Dagda a.k.a. Dag Dia (Daghdha)
    Dáire
    Delbáeth (Dealbhaeth)
    Dian Cecht
    Donn
    Ecne
    Egobail
    Elatha (Ealadha)
    Elcmar (Ealcmhar)
    Goibniu (Goibhniu)
    Lén
    Lir
    Luchtaine a.k.a. Luchta
    Lug a.k.a. Lugh (Lú)
    Mac Cuill, Mac Cecht, and Mac Gréine
    Manannán mac Lir
    Miach
    Midir (Midhir)
    Mug Ruith
    Nechtan
    Neit, Irish god of war, husband of Nemain and/or Badb
    Nuada (Nuadha)
    Ogma (Oghma)
    Seonaidh
    Tethra
    Tuirenn (Tuireann)

Female

    Aibell (Aoibheall)
    Aimend
    Aífe
    Áine
    Airmed a.k.a. Airmid
    Anand a.k.a. Anann a.k.a. Anu
    Badb (Badhbh)
    Banba (Banbha)
    Bec (Beag)
    Bébinn a.k.a. Béfind (Bébhinn, Bébhionn or Béfhionn)
    Bé Chuille
    Beira
    Biróg
    Boand a.k.a. Boann (Bóinn)
    Brigit (Brighid or Bríd)
    Caer
    Caillech (Cailleach)
    Canola
    Cessair (Ceasair)
    Cethlenn (Cethleann)
    Clídna (Clíodhna or Clíona)
    Crob Derg (Crobh Dearg)
    Danand
    Danu (Dana)
    Ériu (Éire)
    Ernmas
    Étaín (Éadaoin)
    Ethniu (Eithne)
    Fand
    Finnguala (Fionnghuala or Fionnuala)
    Flidais
    Fódla (Fódhla)
    Lí Ban- (Líban or Liban)
    Macha
    Medb (Meadhbh or Méabh)
    Medb Lethderg (Meadhbh or Méabh Leathdhearg)
    Mongfind (Mongfhionn)
    Morrígan (Morríghan)
    Mór Muman (Mór Mumhan)
    Nemain (Nemhain)
    Niam (Niamh)
    Nic Naomhín
    Plor na mBan
    Sheela na Gig
    Scathach
    Tailtiu (Taillte)