Arnold Mylius (October 16, 1540 - November 17, 1604) was a German bookseller, editor, and printer, living and trading in Cologne between 1585 and 1604. He was born in Freimersheim, Germany. He was trained in Antwerp under Arnold Birckmann, and took over management of Birckmann's firm on behalf of his heirs and eventually taking over the Birckmann publishing house himself. During his time in Antwerp he would collaborate with luminaries such as Plantin. Possibly to escape the religious conflicts of the Low Countries, he left Antwerp for Cologne, where he would marry. He would publish over 200 books; his work extended into the geographical world with his edit of Willibald Pirckheimer's translation of Ptolemy's Geographia appearing in Gerard Mercator's 1584 Cl Ptolemaei Alexandrini Geographiae libri octo.
