A Crystal Age is a utopian novel/ Dystopia written by W. H. Hudson, first published in 1887. The book has been called a "significant S-F milestone" and has been noted for its anticipation of the "modern ecological mysticism" that would evolve a century later. The book was first issued anonymously in 1887. The second edition of 1906 identified the author by name, and included a preface by Hudson. The third edition of 1916 added a foreword by Clifford Smith.