The Smithsonian Channel is an American pay television channel owned by ViacomCBS through its domestic media networks division.It offers video content inspired by the Smithsonian Institution's museums, research facilities and magazines.

The channel features original non-fiction programming that covers a wide range of historical, scientific and cultural subjects. As of February 2015, approximately 33.6 million American households (28.9% of those with television) receive Smithsonian Channel. It is also available as a video on demand service, depending on the service provider, and in various Internet streaming and download formats.

The channel was launched as a joint venture of Showtime Networks and the Smithsonian Institution as Smithsonian On Demand in 2006, and later became Smithsonian Channel in 2007.Smithsonian Channel Plus, a US$5 monthly subscription also offering access to the channel's past content library, and incorporating the former Smithsonian Earth streaming service, was launched in 2018, however, since ViacomCBS' expansion of CBS All Access containing all of the service's content, it can be deemed as deprecated. It is available on several device platforms, and via the web.

As of 2020, Smithsonian Channel: UK & Ireland broadcasts free-to-air, available on Freeview digital terrestrial television channel 57, as well as on cable and satellite broadcasts.[