Faith-Based Organisations (FBOs) have become pivotal actors in Nigeria’s humanitarian-development nexus, leveraging moral authority, dense grassroots networks, and service infrastructure to reach underserved populations. Using a qualitative, desk-based comparative design, this paper assesses the contributions and operational processes of four leading Christian FBOs, Caritas Nigeria (CCFN), CRUDAN, CHAN and FOMWAN, across emergency response, health, agriculture and livelihoods, and social protection. Findings indicate that the fourorganisations provide scale, access, and staying power in fragile settings, but face persistent challenges around sustainable financing, coordination, monitoring and evaluation (M&E), and safeguarding. The paper concludes with actionable recommendations on government-FBO compacts, pooled financing, interoperable data systems, and joint standards for accountability