Background: Multiple sources of regulation seek to shape euthanasia practice in Belgium, including legislation and training. This study comprehensively mapped which of these sources govern which domains of euthanasia practice, such health professionals’ obligations, or managing patient requests. Method: Scoping review methodology was used to search for scholarly records which discussed Belgian euthanasia regulation. Template analysis was used to generate themes describing the domains of euthanasia practice governed by sources of regulation. Results: Of 1364 records screened, 107 records were included. Multiple sources of regulation govern each domain, which are: the permissible scope of euthanasia; the legal status of a euthanasia death; the euthanasia process; the rights, obligations, and roles of those involved; system workings; and support for health professionals who provide euthanasia. Conclusions: Domains with significant yet fragmented regulation may lead to inconsistent care provision. Policymakers should develop coherent guidance to support health professionals to navigate this regulatory landscape.