Social marketing is regarded as an effective consumer-oriented approach to promoting behavioural change and improved well-being for individuals, communities and society. However, its potential for tourism, especially sustainable tourism, remains under-researched. This article examines the utilisation of social marketing by tourism businesses. A search strategy identified 14 behavioural change programmes that involved tourism businesses. Half of these programmes label themselves social marketing; the others tend to be part of corporate social responsibility efforts, using a form of corporate social marketing (CSM). Most programmes seek to encourage pro-environmental behaviours in tourists, tourism businesses and other stakeholders including suppliers. Although tourism businesses can develop social marketing programmes alone, typically they collaborate with public and non-profit agencies as partners and sponsors. The strength of the tie between the promoted behaviour and the sale of a company's product varies considerably. It is suggested that social marketing can make significant contributions to environmentally sustainable tourism. However, this research also suggests that social marketing is not a substitute for, but rather an essential complement to, technological and regulatory approaches to climate change. Changing behaviour is a long process: without a long-term commitment from private sector companies, CSM programmes will fail to achieve behavioural change goals.