BBC One (or BBC1 and BBC 1) is the first and flagship television channel of the BBC in the United Kingdom, Isle of Man and Channel Islands. It was launched on 2 November 1936 as the BBC Television Service, and was the world's first regular television service with a high level of image resolution. It was renamed BBC TV in 1960, using this name until the launch of the second BBC channel BBC2 in 1964, whereupon the BBC TV channel became known as BBC1, with the current spelling adopted in 1997.

The channel's annual budget for 2012–13 was £1.14 billion. The channel is funded by the television licence fee together with the BBC's other domestic television stations, and shows uninterrupted programming without commercial advertising. It is currently the most watched television channel in the United Kingdom, ahead of its traditional rival for ratings leadership, ITV.

As of June 2013, the channel is headed by Charlotte Moore, the BBC's Director of Content.