The Royal Television Society (RTS) is a British-based educational charity for the discussion, and analysis of television in all its forms, past, present, and future. It is the oldest television society in the world. It currently has fourteen regional and national centres in the UK, as well as a branch in the Republic of Ireland.

The group was formed as the Television Society on 7 September 1927, a time when television was still in its experimental stage. Regular high-definition (then defined as at least 200 lines) broadcasts did not even begin for another nine years until the BBC began its transmissions from Alexandra Palace in 1936.

In addition to serving as a forum for scientists and engineers, the society published regular newsletters charting the development of the new medium. These documents now form important historical records of the early history of television broadcasting.

The society was granted its Royal title in 1966. The Prince of Wales became patron of the Society in November 1997.

The society regularly holds meetings and seminars, attended by members of the public and professionals from various areas of the television industry, and it also publishes the monthly magazine Television, covering a broad range of television topics.

Major events held by the RTS include the biennial RTS Cambridge Convention, a three-day event held at King's College, Cambridge. The convention, chaired by one of the UK's major broadcasters, brings together influential figures from the television industry for a series of stimulating talks.

The RTS also hosts "Anatomy of a Hit" events, which gather together the writers, cast and commissioner of some of Britain's most successful TV shows to discuss their qualities. Recent programmes discussed have included Sherlock, Doctor Who, and Humans.

The society also holds a substantial archive of printed, photographic, and audio-visual material of value to television historians and scholars.