The Celtic Druids (first published between 1827 and 1829) is a 19th-century esoteric work by Godfrey Higgins, which aims to demonstrate that the Druids were priests of Oriental colonies who emigrated from India. Higgins posits that these Druids were responsible for the introduction of early writing systems (the Cadmean system) and were the builders of monumental megalithic sites like Stonehenge and Carnac. This scholarly work is a significant piece of 19th-century historical speculation, filled with detailed prints and maps, and is considered a valuable resource for those studying the history of Druidism or the history of ancient European belief systems.