Sustainable digital finance is a topic of growing interest among sustainability advocates who are seeking ways to influence digital finance operators to offer sustainability-oriented digital finance services. This study defines sustainable digital finance, identify some characteristics of the emerging sustainable digital finance sector and forecasts what sustainable digital finance should be. The study shows the emergence of digitalisation policies, digital finance policies and sustainability and climate change policies which do not address the needs of sustainable digital finance as well as a low interest in sustainable digital finance, a general reluctance towards sustainable digital finance, the rise of green washing by firms, and the growing interest in sustainable digital finance information among the public. The study also show that the aspiration for sustainable digital finance is to build an ecosystem where there are ESG-compliant digital finance laws and regulations, a well-developed sustainable digital finance sandbox to develop sustainability-oriented digital financial services, international standards for sustainable digital finance and an ecosystem where digital finance tools are used to promote environmental sustainability and where the industry takes the lead in developing sustainable digital finance initiatives.