This chapter explores the dimensions of financial sustainability as well as the principles needed to manage a nonprofit organization that can generate continuous funding through diverse sources in order to support its vision and mission in a way that is socially and environmentally sustainable. Sustainability is the ability of a business, an organization, or a project to fulfill its vision and mission, meet its goals, and serve its stakeholders over time. The chapter discusses the inherent, collateral, and environmental factors of financial sustainability in nonprofit organizations. Inherent factors of financial sustainability include: Financial management, budget, financial statement analysis, financial sustainability plan, social enterprise, fund-raising, grant seeking, investment, and risk management. Collateral factors of financial sustainability include: Governance, leadership, and strategic planning. The chapter describes key indicators that can reveal whether an organization is financially sustainable or is on the path for financial sustainability.