Gerhard Cassius Faye (8 March 1846 - 30 January 1917) was a Danish pharmacist and factory manager.
He was later the same year engaged as acting assistant at the University of Copenhagen's chemical laboratory, mostly for the crystallographer Haldor Topsøe.
He published numerous articles on agriculturalm statistical and economic questions, for instance in Landbovennen and Ugeskrift for Landmænd.
In Aarsberetning om Maribo Amts økonomiske Selskabs Virksomhed 1912, he contributed with an article on the early years of Lolland's ugar industry.
The son, Aage Faye, who succeeded him as manager of Nakskov Sugar Factory, owned Øbjerggaard from 1913 to 1918[2] and Birkendegård from 1921 and until his death in 1949.