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Lobby Lud is a fictional character created in August 1927 by the Westminster Gazette, a British newspaper, now defunct. The character was used in readers' prize competitions during the summer period. Anonymous employees visited seaside resorts and afterwards wrote down a detailed description of the town they visited, without giving away its name. They also described a person they happened to see that day and declared him to be the "Lobby Lud" of that issue. Readers were given a pass phrase and had to try to guess both the location and the person described by the reporters. Anyone carrying the newspaper could challenge Lobby Lud with the phrase and receive five pounds (about £300 in 2021).

The competition was created because people on holiday were known to be less likely to buy a newspaper. Some towns and large factories had holiday fortnights (called "wakes weeks" in the north of England); the town or works would all decamp at the same time. Circulation could drop considerably in the summer and proprietors hoped prizes would increase it.

The character's name was derived from the paper's telegraphic address, "Lobby, Ludgate".

The British colloquial phrase "You are (name) and I claim my five pounds" is associated with Lobby Lud, despite being based on a similar idea thought up by a different paper.