Solar climate engineering—intentional modification of the planet’s reflectivity—is coming under increasing consideration as a means to counter climate change. At present, it offers the possibility of greatly reducing climate risks, but would pose physical and social risks of its own. This chapter offers an introduction to solar climate engineering, and explores its potential, risks, and legal and regulatory challenges. It also contextualizes these proposals with respect to other emerging technologies and the broader socio-political milieu. The chapter discusses the contours of existing and potential regulation, particularly at the international level. These aspects include regulatory rationales, diverse characteristics of proposed regulatory regimes, difficulties in defining the regulatory target, and the management of uncertainty through precaution. The chapter closes with suggested future research directions in the law and regulation of solar climate engineering.