[[File:Celts in Europe.png|400px|thumb|Map1: Diachronic distribution of Celtic peoples (ancient and modern): {{legend|#ffff43|core Hallstatt territory, by the 6th century BC}} {{legend|#97ffb6|maximal Celtic expansion, by 275 BC}} {{legend|#d2ffd2|Two land areas in Iberian Peninsula where Celtic presence is uncertain or disputed by some: Lusitanian and Vettonian land (Para-Celtic?), Caristii and Varduli land (Vasconic, Celtic or Para-Celtic?), in today's Basque Country.}} {{legend|#27c600|the six Celtic nations which retained significant numbers of Celtic speakers into the Early Modern period}} {{legend|#1a8000|areas where Celtic languages remain widely spoken today}} ]] This is a list of ancient Celtic peoples and tribes.

Continental Celts

Continental Celts were the Celtic peoples that inhabited mainland Europe. In the 3rd and 2nd centuries BC, Celts inhabited a large part of mainland Western Europe and large parts of Western Southern Europe (Iberian Peninsula), southern Central Europe and some regions of the Balkans and Anatolia. They were most of the population in Gallia, today's France, Switzerland, possibly Belgica – far Northern France, Belgium and far Southern Netherlands, large parts of Hispania, i.e. Iberian Peninsula – Spain and Portugal, in the northern, central and western regions; southern Central Europe – upper Danube basin and neighbouring regions, large parts of the middle Danube basin and the inland region of Central Asia Minor or Anatolia. They lived in these many regions forming a large arc stretching across from Iberia in the west to the Balkans and Anatolia in the east. Many of the populations from these regions were called Celts by ancient authors. They are thought to have spoken Gaulish (P-Celtic type), Lepontic (P-Celtic type), Hispano-Celtic (Celtiberian and Western Hispano-Celtic or Gallaecian) (Q-Celtic type), Eastern Celtic or Noric (unknown type). P-Celtic type languages are more innovative (*kʷ > p) while Q-Celtic type languages are more conservative. However, it is not fully known if this grouping of peoples, such as their languages, is a genealogical one (phylogenetic), based on kinship, or if it is a simple geographically based group. Classical Antiquity authors did not describe the peoples and tribes of the British Islands as “Celts” or “Galli” but by the name “Britons”. They only used the name “Celts” or “Galli” for the peoples and tribes of mainland Europe.

Eastern Celts

They lived in Southern Central Europe (in the Upper Danube basin and neighbouring regions) which is hypothesized as the original area of the Celts (Proto-Celts), corresponding to the Hallstatt Culture. Later they expanded towards the Middle Danube valley and to parts of the Balkans and towards inland central Asia Minor or Anatolia (Galatians). Hercynian Forest (Hercynia Silva), north of the Danube and east of the Rhine was in their lands. Celts, especially those from Western and Central Europe, were generally called by the Romans “Galli” i.e. “Gauls”, this name was synonym of “Celts”, this also means that not all of the peoples and tribes called by the name “Gauls” (Galli) were specifically Gauls in a narrower more regional sense. Their language is scarcely attested and can not be classified as a P-Celtic or Q-Celtic. Some closely fit the concept of a tribe. Others are confederations or even unions of tribes.

Galatians

In the middle 3rd century BC, Celts from the middle Danube valley, immigrated from Thrace into the highlands of central Anatolia (modern Turkey), which was called Galatia after that. These people, called Galatians, a generic name for “Celts”, were eventually Hellenized, but retained many of their own traditions. They spoke Galatian, a name derived from the generic name for “Celts”. Some closely fit the concept of a tribe. Others are confederations or even unions of tribes.

Gauls (Galli or Celtae)

Gauls were the Celtic people that lived in Gaul having many tribes but with some influential tribal confederations. Galli (Gauls), for the Romans, was a name synonym of “Celts” (as Julius Caesar states in De Bello Gallico ) which means that not all peoples and tribes called “Galli” were necessarily Gauls in a narrower regional sense. Gaulish Celts spoke Gaulish, a Continental Celtic language of the P Celtic type, a more innovative Celtic language - *kʷ > p. Romans initially organized Gaul in two provinces (later in three): Transalpine Gaul, meaning literally "Gaul on the other side of the Alps" or "Gaul across the Alps", is approximately modern Belgium, France, Switzerland, Netherlands, and Western Germany in what would become the Roman provinces of Gallia Narbonensis, Gallia Celtica (later Lugdunensis and Aquitania) and Gallia Belgica. Some closely fit the concept of a tribe. Others are confederations or even unions of tribes.

Cisalpine Gauls

Lepontine Celts

They seem to have been an older group of Celts that lived in Cisalpine Gaul before the Gaulish Celtic migration. They spoke Lepontic (a Continental Celtic language) a Celtic language that seems to precede Cisalpine Gaulish.

Celto-Ligurians / Gallo-Ligurians

May have been Celtic tribes influenced by Ligurians, heavily Celticized Ligurian tribes that shifted to a Celtic ethnolinguistic identity or mixed Celtic-Ligurian tribes. They dwelt in southeastern Transalpine Gaul and northwestern Cisalpine Gaul, mainly in the Western Alps regions, Rhodanus eastern basin and upper Po river basin.

Hispano-Celts / Celts of Hispania

They lived in large parts of the Iberian Peninsula, in the Northern, Central, and Western regions (half of the Peninsula's territory). The Celts in the Iberian peninsula were traditionally thought of as living on the edge of the Celtic world of the La Tène culture that defined classical Iron Age Celts. Earlier migrations were Hallstatt in culture and later came La Tène influenced peoples. Celtic or (Indo-European) Pre-Celtic cultures and populations existed in great numbers and Iberia experienced one of the highest levels of Celtic settlement in all of Europe. They dwelt in northern, central and western regions of the Iberian Peninsula, but also in several southern regions. They spoke Celtic languages - Hispano-Celtic languages which were of the Q-Celtic type, more conservative Celtic languages. Romans initially organized the Peninsula in two provinces (later in three): Hispania Citerior ("Nearer Hispania", "Hispania that is Closer", from the perspective of the Romans), was a region of Hispania during the Roman Republic, roughly occupying the northeastern coast and the Iberus (Ebro) Valley and later the eastern, central, northern and northwestern areas of the Iberian peninsula in what would become the Tarraconensis Roman province (of what is now Spain and northern Portugal). Hispania Ulterior ("Further Hispania", "Hispania that is Beyond", from the perspective of the Romans) was a region of Hispania during the Roman Republic, roughly located in what would become the provinces of Baetica (that included the Baetis, Guadalquivir, valley of modern Spain) and extending to all of Lusitania (modern south and central Portugal, Extremadura and a small part of Salamanca province). The Roman province of Hispania included both Celtic speaking and non-Celtic speaking tribes. Some closely fit the concept of a tribe. Others are confederations or even unions of tribes.

Western Hispano-Celts (Celts of Western Hispania)

Western Hispano-Celts were Celtic peoples and tribes that inhabited most of north and western Iberian Peninsula regions. They are often confused or taken as synonym of Celtiberians but, in fact, they were a distinct Celtic population that was most part of Iberian Peninsula Celtic populations. They spoke Gallaecian (a Continental Celtic language of the Q Celtic type, a more conservative Celtic language) which was not Celtiberian (Celtic languages of Iberian Peninsula are often lumped as Hispano-Celtic).

Eastern Hispano-Celts (Celtiberians)

Eastern Iberian meseta (Spain), mountains of the headwaters of the rivers Douro, Tagus, Guadiana (Anas), Júcar, Jalón, Jiloca and Turia, (tribal confederation). Mixed Celtic and Iberian tribes or Celtic tribes influenced by Iberians. Not synonymous of all the Celts that lived in the Iberian Peninsula but to a narrower group (the majority of Celtic tribes in the Iberian Peninsula) were not Celtiberians. They spoke Celtiberian (a Continental Celtic language of the Q Celtic type, a more conservative Celtic language).

Insular Celts

Insular Celts were the Celtic peoples and tribes that inhabited the British Islands, Britannia (Great Britain), the main largest island to the east, and Hibernia (Ireland), the main smaller island to the west. There were three or four distinct Celtic populations in these islands, in Britannia inhabited the Britons, the Caledonians or Picts, the Belgae (not surely known if they were a Celtic people or a distinct but closely related one); in Hibernia inhabited the Hibernians or Goidels or Gaels. Britons and Caledonians or Picts spoke the P-Celtic type languages, a more innovative Celtic language (*kʷ > p) while Hibernians or Goidels or Gaels spoke Q-Celtic type languages, a more conservative Celtic language. Classical Antiquity authors did not call the British islands peoples and tribes as Celts or Galli but by the name Britons (in Britannia). They only used the name Celts or Gauls for the peoples and tribes of mainland Europe.

Britons (Celts)

They spoke Brittonic (an Insular Celtic language of the P Celtic type). They lived in Britannia, it was the name Romans gave, based on the name of the people: the Britanni. Some closely fit the concept of a tribe but others are confederations or even unions of tribes.

Picts / Caledonians

They were a different people from the Britons, but may have shared common ancestry. They lived as a tribal confederation in Caledonia (today's Northern Scotland); the Caledonian Forest (Caledonia Silva) was in their land.

Goidels / Gaels / Hibernians

They spoke Goidelic (an Insular Celtic language of the Q Celtic type. According to Ptolemy's Geography (2nd century AD) (in brackets the names are in Greek as on the map):

Possible Para-Celts

Para-Celtic has the meaning that these peoples had common ancestors with the Celts but were not Celts themselves (although they were later Celticized and belong to a Celtic culture sphere of influence), they were not direct descendants from the Proto-Celts. They may in fact have been Proto-Celto-Italic, predating the Celtic or Italic languages and originated earlier from either Proto-Celtic or Proto-Italic populations who spread from Central Europe into Western Europe after new Yamnaya migrations into the Danube Valley. Alternatively, a European branch of Indo-European dialects, termed "North-west Indo-European" and associated with the Beaker culture, may have been ancestral to not only Celtic and Italic, but also to Germanic and Balto-Slavic. ===Belgae === A people or a group of related tribes that dwelt in Belgica, parts of Britannia, and may have dwelt in parts of Hibernia and also parts of Hispania (large tribal confederation). According to classical authors works, like Caesar's De Bello Gallico, they were a different people and spoke a different language (Ancient Belgic) from the Gauls and Britons; they were clearly an Indo-European people and may have spoken a Celtic language. There is also the possibility that their language may have been a different language branch of Indo-European from the Nordwestblock culture, which may have been intermediary between Germanic and Celtic, and might have been affiliated to Italic (according to a Maurits Gysseling hypothesis).

Ligurians

Northern Mediterranean Coast straddling South-east French and North-west Italian coasts, including far Northern and Northwestern Tuscany and Corsica. Because of the strong Celtic influences on their language and culture, they were known already in antiquity as Celto-Ligurians (in Greek Κελτολίγυες, Keltolígues). Very little is known about this language, Ligurian (mainly place names and personal names remain) which is generally believed to have been Celtic or Para-Celtic; (i.e. an Indo-European language branch not Celtic but more closely related to Celtic). They spoke ancient Ligurian.

Lusitanians-Vettones

Turdetanians

Today's Western Andalusia (Hispania Baetica), Baetis (Guadalquivir) river valley and basin, Marianus Mons (Sierra Morena), some consider them Celtic, may have been Pre-Celtic Indo-European people as the Lusitani and Vettones. If their language, called Turdetanian or Tartessian, was not Celtic it may have been Para-Celtic like Ligurian (i.e. an Indo-European language branch not Celtic but more closely related to Celtic). Also may have been a non-Indo-European people related to the Iberians, but not the same people. A tribal confederation but with much more centralized power, may have formed an early form of Kingdom or a Proto-civilisation (see Tartessos)

Veneti (Adriatic Veneti)

Transitional people between Celts and Italics? Celticized Italic people? Para-Celtic people?

Possible Celts mixed with other peoples

Celto-Dacian-Germanic

Celto-Germanic

Celtic-Germanic-Iranian

Celto-Illyrians?

Ibero-Celto-Ligurians

Non-Celtic people, heavily Celticized

Rhaetians

They lived in the Central Alps, eastern parts of present-day Switzerland, the Tyrol in Austria, and the Alpine regions of northern Italy. They spoke the Rhaetian language. There is evidence that much of the non-Celtic (and Pre-Indo-European) elements (see Tyrsenian languages) of their territory had, by the time of Augustus, been assimilated to varying degrees by the influx of Celtic tribes and had adopted Celtic speech. In addition, the abundance of Celtic toponyms leads to the conclusion that, by the time of Roman conquest, the Rhaetians were significantly Celticized.