Earthfasts may refer to:
- Earthfast is old English for post in ground construction, for example prehistoric megalithic monuments that were built for some long-lost religious purpose. Most are in desolate places. They are earthfast, that is, they are visible on the surface, but are fast in the earth.
- Earthfasts trilogy by William Mayne, comprising Earthfasts, Cradlefasts and Candlefasts, an unusual evocation of the King Arthur legend.
- Earthfasts (TV series), a 1994 BBC children's drama based on the book by William Mayne
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