[[File:Celts in Europe.png|upright=.9|thumb|right|The Celts in Europe, past and present:
{{legend|#1a8000|Present-day Celtic-speaking areas}}
{{legend|#27c600|Other parts of the six most commonly recognized "Celtic nations" and where a Celtic language is spoken but not the dominating language}}
{{legend|#97ffb6|Other parts of Europe once peopled by Celts; modern-day inhabitants of many of these areas often claim a Celtic heritage and/or culture}}
{{legend|#D2FFD2|Lusitanian area of Iberia, "Celticity" uncertain}}
{{legend|yellow|The core Hallstatt territory, expansion before 500 BC}}
]]