Brandalism (a portmanteau of 'brand' and 'vandalism') is an activist artist collective founded in 2012 in the United Kingdom which engages in subvertising, culture jamming, and protest art.

Prior to the formal emergence of Brandalism, similar creative activist movements had existed, using culture jamming, subvertising and détournement to promote a range of social and political issues throughout history.

These include during the 2015 United Nations Climate Change Conference in Paris and the 2019-2020 Australian bushfire season, where the Brandalism movement sought to draw attention to topics such as environmental degradation, visual pollution, debt and the representation of body image in advertising.

[5] Brandalism is a movement that practices ‘culture jamming’[citation needed] – a campaigning technique that uses mass-marketing tools subversively to criticise consumerism, advertising and mass media.

[10] Between 2000 and 2004 Greenpeace pressured Coca Cola to abandon the use of hydroflurocarbons by placing stickers and posters on Coca-Cola products and refrigerators and vending machines.

These parodied the company's then signature images of polar bears, but had them floating on melting icebergs and used the corporation's calligraphy for wording such as “Enjoy Climate Change.

Following this, the Brandalism network expanded and large projects emerged during the 2015 UN Climate Change Conference in Paris and the 2020 bushfire season in Australia.

Over a five-day period, a team of 28 artists installed satirical parodies of corporate advertisements over 36 large format billboards in Leeds, Manchester, Birmingham, Bristol and London.

[12] The project was titled ’48 sheet’ and sought to comment on the impacts of advertising on culture and community, specifically targeting the “brand mania” surrounding the London Olympic games.

During the conference, attending parties negotiated the Paris Agreement, an international commitment to reducing carbon emissions and combatting climate change.

[16] Across Paris, Brandalism activists covered over posters from JC Decaux, an outdoor advertising multi-national corporation and major sponsor of the climate conference.

[22] This Brandalism project emerged in response to HSBC's announcement that it would aim to reduce its carbon emissions to zero by 2050, with activists claiming that this target was inadequate.

Brandalism campaigners produced satirical advertisements accusing HSBC of “climate colonialism” and protesting against its investment in fossil fuels, links to deforestation and alleged involvement in human rights abuses.

[23] The Brandalism movement is a form of grassroots campaigning that seeks to evoke change and promote awareness about various political issues through creative activism.

[24] By intervening in public advertising spaces, the Brandalism movement seeks to challenge the power of large corporations and their role in climate change.

[30] If a subverted advertisement has brought a company or label into disrepute, a brand owner may bring a claim of injurious or Malicious falsehood against the artist.