20th century advertising is the most powerful and sustained system of propaganda in human history and its cumulative cultural effects, unless quickly checked, will be responsible for destroying the world as we know it. As it achieves this it will be responsible for the deaths of hundreds of thousands of non-western peoples and will prevent the peoples of the world from achieving true happiness. Simply stated, our survival as a species is dependent upon minimizing the threat from advertising and the commercial culture that has spawned it. — Sut Jahally

Subvertising is a portmanteau of subversion and advertising. It is a relatively modern term, but can be defined as any type of action that is taken to subvert advertising. This may range from improvised graffiti-style interventions, to the more co-ordinated campaigns of the modern era. Generally speaking, subvertising either targets the original adverts or the sites of outdoor advertising (or both).

Subvertisers for London is a short film about subvertising in London.