One Man Band, also known as London and Swinging London is an unfinished short film made by Orson Welles between 1968 and 1971. The film started life as a part of a 90-minute TV special for CBS, entitled Orson's Bag, consisting of Welles' 40-minute condensation of The Merchant of Venice, and assorted sketches around Europe. This was abandoned in 1969 when CBS withdrew its funding over Welles' long-running disputes with US authorities regarding his tax status, and Welles continued to fashion the footage in his own style.

The film features contributions from British comedians Tim Brooke-Taylor, Graeme Garden, and Bill Oddie, before the trio became known as The Goodies.