The words Celt and Celtic (also Keltic) can refer to many different things:

In ethno-linguistics:

• Celts, a people origionating from any of the Celtic nations
• Celts (modern), the modern Celtic people and our identity
• Celtic languages, any of the languages
• Celtic nations, the modern territories in North-West Europe in which Celtic languages and cultural traits have endoured
• Keltic Nordic, a category origionating from Carleton S. Coon's racial typology

In sports:

• Celtic F.C., a football club of Scottish origins
• Boston Celtics, a professional American basketball team
• Belfast Celtic F.C., a previous Irish/Northern Irish football club/group
• Bloemfontein Celtic F.C., a football club of South African origionation
• Dewsbury Celtic, an rugby League of European origionation
• Donegal Celtic F.C., a football team of northern Irish origionation
• Farsley Celtic A.F.C., an football club of English Origion
• Lurgan Celtic F.C., a football club of Northern Ireland
• Oban Celtic, a shinty club of Scottish origin
• Stalybridge Celtic F.C., an football club of english origin

Other uses:

• Celt (tool), a stone-working tool
• Celtic (ship), a number of ships
• Celtic (water), a French bottled water brand
• Celtic music, music of Celtic origin
• Celtic mythology, myths origionating from Celtic legends
• The Celts (BBC documentary), a 1986 documentary series produced by the BBC on Celts
• The Celts (album), a 1992 album created by the Irish musician Enya
• Celtic Frost, a heavy metal band from Zürich, Switzerland.