Ghee, known as TG to fans, persuaded Vincent Tan to buy into Cardiff City when the club was having financial difficulties under Peter Ridsdale.
The Malaysian has been chairman of Cardiff since May 2010 and a director since May 2009.
"TG is embarking on new career and business pursuits that requires his full attention," said a club statement.
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This comes as a surprise to me personally for Tien Ghee has always been in the front line and was very passionate about football especially at the grassroots.
Cardiff City, meanwhile, assured fans there will not be any change in name (Cardiff Dragons) following BBC Wales' interview with the club's owner Malaysian tycoon Vincent Tan.
HD says: Hmm....