Celticism may refer to:
- A word or linguistic property adapted from a Celtic language (cf. Anglicism, Germanism)
- Political pan-Celticism
- The ideology of Lega Nord which culturally identifies with the Celtic people
- The romanticist Celtic Revival
- Celts (modern), a modern Celtic identity that has emerged in Western Europe since the 18th century
- Celtism also known as Celtic neopaganism
- Celticisation, the historic process of conquering and assimilating by the ancient Celts
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