Satellite system: 1December 2011;14 years ago(2011-12-01) Terrestrial digital: 1April 2014;12 years ago(2014-04-01) Satellite and digital: 2December 2015;10 years ago(2015-12-02)
One 31 (Thai: สถานีโทรทัศน์ช่องวัน 31) and branded as One HD 31, is a Thai digital terrestrial television channel owned by GMM Grammy under The One Enterprise. The network offers a variety of content such as drama, variety programs, competition, news and entertainment programs.
One 31 first aired on 1 December 2011 with the name 1-Sky One (วัน-สกาย วัน) with content and television programs produced by companies under GMM Grammy. On 1 April 2012, it changed its name into GMM Z Hitz (จีเอ็มเอ็มแซต ฮิตส์).
On 1 November 2012, the channel changed its name to GMM One. Its current name, One 31 was adopted on 2 December 2015.