One 31

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.