One 31, fully known as Channel One 31 (Thai: สถานีโทรทัศน์ช่องวัน 31) and branded as One31 or One31 HD, is a Thai digital terrestrial television channel owned by GMM Grammy. The network offers a variety of content such as drama, variety programs, competition, news, and entertainment programs.
One 31 first aired on December 1, 2011, with the name 1-Sky One (วัน-สกาย วัน) with content and television programs produced by companies under GMM Grammy. On April 1, 2012, it changed its name into GMM Z Hitz (จีเอ็มเอ็มแซต ฮิตส์).
On November 1, 2012, the channel changed its name to GMM One. Its current name, One 31 was adopted on December 2, 2015.
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