There has been very little debate about the practical forms that ecological citizenship might take. Ethical investment, which seeks to influence companies to adopt responsible policies that benefit society and the environment, has grown rapidly in recent years, particularly in the UK. Dobson has identified four defining characteristics that are used in this article to assess whether ethical investment is an example of ecological citizenship. The evidence demonstrates that individual ethical investors are engaged in an activity that displays all the characteristics of ecological citizenship. However, the case for regarding institutional investors as ecological citizens is weak, although citizenship arguments have the potential to strengthen the case for corporate social responsibility.