GDH 559 Co., Ltd. (Thai: บริษัท จีดีเอช ห้าห้าเก้า จำกัด), usually known as GDH, is a film studio subsidiary to the Thai entertainment conglomerate GMM Grammy. It was founded on 5 January 2016 as a successor to GMM Tai Hub (GTH) — Thailand's most successful film studio of the prior 11 years — which had been dissolved in December 2015 due to internal conflicts between the company's three major shareholders — GMM Grammy, and Hub Ho Hin. GDH had released films of various genres such as romance, comedy, horror and drama as well as the hit film Bad Genius.