Complex infrastructure finance transactions are characterized by high capital intensity, extended repayment horizons, and significant political, market, and operational risks. The involvement of diverse stakeholders—including governments, private investors, development finance institutions, contractors, and regulators—further amplifies complexity, making effective negotiation and structured deal design critical to project success. This study explores strategic negotiation methodologies and multi-stakeholder deal structuring as foundational mechanisms for aligning diverse interests, optimizing risk allocation, and ensuring long-term sustainability of infrastructure investments. Strategic negotiation methodologies, including interest-based bargaining, game-theoretic approaches, and adaptive negotiation models, provide frameworks for building consensus, fostering collaboration, and anticipating dynamic changes in policy or market conditions. The integration of cross-cultural and political sensitivities is highlighted as essential, particularly in emerging markets where institutional capacities and governance frameworks may be uneven. These negotiation tools enable parties to move beyond adversarial positions toward cooperative solutions that maximize shared value. Multi-stakeholder deal structuring complements negotiation by embedding agreed principles into resilient financial and governance frameworks. Mechanisms such as blended finance, syndicated lending, and equity–debt hybrids distribute risk and enhance project bankability, while credit enhancements and guarantees provided by multilateral institutions mitigate sovereign and counterparty risks. Transparent governance structures, performance-based contracting, and ESG-linked incentives further strengthen trust and accountability across parties. Case illustrations from energy, transport, and digital infrastructure projects demonstrate how carefully designed negotiation and structuring strategies determine the difference between successful implementation and costly project failure. This concludes that advancing infrastructure finance requires a paradigm shift toward data-driven, transparent, and inclusive negotiation models coupled with robust deal structuring. These innovations are essential for mobilizing capital, safeguarding stakeholder interests, and achieving sustainable infrastructure outcomes in both developed and emerging contexts.