Celt merupakan beberapa kumpulan yang berkait di Eropah tengah pada masa silam yang berkongsi kebudayaan dan ciri-ciri bahasa asal. Masa kini, "Celtic" sering digunakan untuk menggambarkan penduduk beberapa kelompok etnik, termasuk kebudayaan dan bahasanya, di Kepulauan British, daerah Bretagne di Perancis dan daerah Galicia di Sepanyol yang turut berkongsi ciri-ciri serupa Celt asal. Walaubagaimanapun pada masa silam, mereka tidak semestinya dianggap berkait dengan Celt oleh orang luar (puak atau negara dari tanah besar daerah Celt, seperti Gaul dan Belgium, diketahui berpindah ke kepulauan British, seperti Atrebates, Menapii, dan Parisi, bagaimanapun, dan menyumbang kepada pembentukan penduduk Celt).
Rujukan bertulis mengenai orang Celtic, sebagai keltoi puak tersorok, oleh Hecataeus Yunani pada 517 BC.
"Celt" disebut /kelt/, dan "celtic" sebagai /keltIk/ (dalam SAMPA). Sebutan /seltIk/ hanya patut digunakan bagi pasukan sukan tertentu (contoh. pasukan NBA, Boston Celtics, dan sebelah SFA, Celtic FC).
Istilah 'Celt' or 'Celtic' can be used in several senses - it can denote a group of peoples speaking or descended from speakers of the Celtic Language; or the people of prehistoric Europe who share common cultural traits which are thought to have originated in the Hallstatt and La Tene Cultures. In contemporary terms 'Celtic nations' are usually defined as Wales, Ireland, Scotland, Cornwall, Isle of Man and Brittany due to Celtic languages unique to these areas. Other areas of Europe are associated with being Celtic, such as Galicia in Spain, and Devon, Cumbria and Northumbria in England. Modern day DNA research (such as that by UCL) indicate that the current population of England is primarilly descended from Celtic/ancient British ancestry, although England lacks a surviving common Celtic language. Similarly in Scotland, the Gaelic language is restricted mostly to the northern and western fringes.
The subject of the replacement of the Hallstatt culture ("hall" is the old word for salt) by the La Tène culture, the final stage of the Iron Age, and its gradual transformation into a culture generally referred to as Celtic, is both complex and diverse, however the technologies, decorative practices and metal-working styles of the La Tène were to be very influential on the Celts. The La Tène style was highly derivative from the Greek, Etruscan and Scythian decorative styles with whom the La Tène settlers frequently traded.
Their original homeland has been shown by archaeological findings to have been around the upper reaches of the Danube, in Switzerland, Austria (around the village of Hallstatt) and southern Germany, and before that perhaps the central Asian steppes. From central Europe they spread as far south as the Iberian peninsula, as far north as Scotland and Denmark, as far west as Ireland and as far east as Anatolia, in many cases assimilating the previous inhabitants of these regions as they went.
It was not the Celts but these previous inhabitants who built Stonehenge and the other Neolithic and Bronze Age megalithic monuments in Europe. But even though the Celts did not construct these monuments, the religious significance of these places may well have endured among the conquered people and the Celts eventually adopted the practice of worshipping there as well. Many Celts settled in present-day France. These were the Gauls who are described by Julius Caesar in his Gallic Wars.
Other Celtic tribes invaded Italy, establishing there a city they called Mediolanum (modern Milan) and sacking Rome itself in 390 B.C. Not until 192 B.C. did the Roman armies conquer the last remaining independent Celtic kingdoms in Italy.
Other Central European tribes moved eastwards and settled in Asia Minor, there to become the Galatians (that is, Gauls) to whom an epistle of St Paul's is addressed.
Elsewhere, the Celtic populations were assimilated by others, leaving behind them only a legend and a number of place names such as the Spanish province of Galicia (i.e., Gaul), Bohemia, after the Boii tribe which once lived there, or the Kingdom of Belgium, after the Belgae, a Celtic tribe of Northern Gaul and south-eastern Britain. Their mythology has been absorbed into the folklore of half a dozen other countries. For instance, the famous Medieval English Arthurian tale of "Sir Gawain and the Green Knight" is clearly an adaptation of a much older Irish legend about the exploits of the hero Cu Chulainn.
Argument rages in the academic world as to whether the Celts in Britain were mostly wiped out/pushed west as the lack of evidence for influence of the Celts on Anglo-Saxon society suggests, or whether the Anglo-Saxon migration consisted merely of the social elite and that the genocide was cultural rather than physical due to such relatively few numbers of Anglo-Saxons mixing with the far larger native population. Recent DNA studies have supported that Anglo-Saxon England evolved from the imposition of a new culture on the previously Celtic people of England.
The Celtic cult of the severed head is documented not only in the many sculptured representations of severed heads in La Tene carvings, but in the surviving Celtic mythology, which is full of stories of the severed heads of heroes and the saints who carry their decapitated heads, right down to Sir Gawain and the Green Knight who picks up his own severed head after Gawain has struck it off, just as St. Denis carried his head to the top of Montmartre. Separated from the mundane body, although still alive, the animated head acquires the ability to see into the mythic realm.
Diodorus Siculus, in his 1st century History had this to say about Celtic head-hunting:
Pemburu kepala Celtic memuja gambaran kepata yang dipotong sebagai sumber kuasa rohani yang berterusan. Sekiranya kepala merupakan tempat duduk semangat, memiliki beberapa kepala musuh, yang diambil secara terhormat dalam pertempuran, meningkatkan penghormatan kepada reputasi pahlawan.
Penggunaan perkataan 'Celtic' sebagai istilah menyeluruh bagi penduduk sebelum Roman di Britain telah dicabar oleh beberapa penulis - termasuk Simon James dari Muzium British. His book The Atlantic Celts - Ancient People Or Modern Invention? makes the point that the Romans never used the term 'Celtic' in reference to the peoples of the Atlantic archipelago, i.e the British Isles. He makes it clear that the term was coined as a useful umbrella term in the 18th Century when the English Kingdom united with the Scottish. The British found it expedient to use the hitherto neutral term British for their own imperial ends. Thus a new term was needed to unite nationalists in Scotland, Ireland and Wales. The term 'Celtic' fit the bill. James makes the point that archaeology does not suggest a united Celtic culture and that the term is misleading, no more meaningful than 'Western European' would be today, and is also anachronistic.
Asal pelbagai nama semenjak tempoh klassik bagi penduduk yang dikenali hari ini sebagai Celts adalah kabur dan dipertikaikan. Ia kelihatannya bahawa tidak satupun istilah yang dirakamkan pernah digunakan oleh penutur Celt itu sendiri. Secara khususnya, tidak terdapat rekod istilah "Celt" digunakan berkait dengan penduduk Kepulauan British atau Ireland sebelum abad ke 19.
In the middle ages certain districts of what is now Germany were known as "Welschland" as opposed to "Teutschland".
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