Brain-computer interface (BCI) systems are in a period of rapid development and offer significant potential for the promotion of health and well-being. At the same time, they raise a range of unique ethical, legal, and policy questions, and few BCI-specific rules exist in a fragmented regulatory landscape. This report aims to help develop a responsible and anticipatory governance approach to promote innovation while shaping the trajectory of technology through a set of mechanisms, including (i) soft law, (ii) standardisation and ethics-by-design approaches, (iii) corporate self-governance, and (iv) participatory experiments for upstream governance.