Nigeria stands at a critical crossroads. As Africa’s largest population and economy, its future prosperity is inextricably linked to the quality of its infrastructure. Yet, the nation faces a staggering deficit, with its infrastructure stock at a mere 30 percent of GDP, far below global benchmarks. This article argues that closing this gap requires a fundamental shift in approach, moving beyond traditional public funding to embrace a new era of modern infrastructure financing. We critically examine innovative models from Public-Private Partnerships (PPP) and Green Bonds to blended finance and diaspora investment against the backdrop of Nigeria’s unique challenges: limited fiscal space, governance bottlenecks, and pressing environmental sustainability needs. Through a comparative analysis with peers like Egypt and South Africa and by presenting a clear policy matrix, this article demonstrates that bridging Nigeria’s infrastructure gap is not just about finding more money but about smarter, more sustainable systems that can attract long-term private capital, foster private sector participation, and build a resilient, inclusive foundation for generations to come.