This contribution discusses the role of voluntary sustainabilitysustainability codes of conduct and sustainability regulationregulation in helping to create a more sustainable financial system. The analyzed voluntary codes of conducts are UNEPFI, UNPRIUNPRI, the Equator PrinciplesEquator Principles, GABVGABV, and IRISIRIS. Furthermore, financial sector sustainability regulations, such as the Chinese Green Credit Policy, the Nigerian SustainableSustainable Banking Principles, and the Environmental RiskRisk Management Guidelines for Banks and Financial Institutions in BangladeshBangladesh, will be discussed. Additionally, newer developments, such as the FSB Task Force on Climate-Related Disclosures and climateclimate risk-related reporting regulations for institutional investorsinvestors, will be presented. We conclude that both voluntary codes of conduct and regulations can help to create a more sustainable financial system, particularly if they work in tandem.