Ten HD (stylised as TEN HD) was an Australian free-to-air television channel that launched on 16 December 2007. The channel was available to high definition digital television viewers through Network Ten owned-and-operated stations. The multichannel broadcast live sport, entertainment, films, documentaries, science fiction and news. The channel ceased broadcasting on 25 March 2009, and the following day was replaced by One. Following the government's decision to remove the SD Primary Channel limitations, the channel will return as a HD simulcast in 2016.
Ten HD was officially announced on 14 September 2007, to replace Network Ten's existing high definition service, a simulcast of its standard definition and analogue services, through the use of an amendment to the Broadcasting Services Act 1992 in 2006. The Broadcasting Legislation Amendment (Digital Television) Act 2006 permitted television networks to launch digital multichannels, provided that they are broadcast exclusively in high definition.