The UN Sustainable Development Goals are an ambitious agenda for environmental sustainability, economic development, and social transformation. The SDGs include targets for governments, in partnership with private industry and communities, to improve access to affordable and reliable energy, reduce inequality, protect natural resources, and invest in transparent legal institutions and resilient infrastructure. Although transitioning energy systems towards a low-carbon future is a core aspect of the SDGs, the International Energy Agency anticipates that oil and gas will remain a significant component of the global energy mix for some time. Host Government Instruments are tools which governments use to grant oil and gas companies permission to develop state-owned resources. In addition to bringing substantial resources into governments, these HGIs often also include environmental commitments as well as commitments to local hiring, stakeholder engagement, and investment in economic development programmes. The different structures of HGIs and their precise terms and conditions are crucial determinants of the sustainability of oil and gas operations conducted thereunder. This book addresses how governments can use HGIs to advance the SDGs. Part I introduces the SDGs and the legal institutions and governance related to HGIs, including in relation to international energy development, international environmental treaties, the Paris Agreement, and human rights regimes. Part II examines specific provisions within HGIs and regulatory systems which relate to the oil and gas sector and SDGs. It provides case studies to illustrate approaches to HGIs and to identify opportunities for host governments and international oil and gas companies to advance the SDGs. The book concludes with a summary of recommendations regarding how host governments, in partnership with the oil and gas industry, can use HGIs to advance economic development and sustainability goals, and advances potential insights towards development of new and renewable resources.