Agricultural production in many developing countries remains predominantly rain-fed and increasingly vulnerable to climate variability, undermining food security and rural livelihoods. Irrigation development is widely recognized as a critical climate adaptation strategy; however, financing constraints continue to limit its expansion, particularly in Sub-Saharan Africa. This study examines global experiences in irrigation financing and draws policy-relevant lessons for Kenya. Using a qualitative, review-based methodology guided by PRISMA principles, the study synthesizes empirical evidence on five irrigation financing models: public sector–led financing, public–private partnerships (PPPs), blended finance, farmer-led and user-financed irrigation, and climate and green financing instruments. The findings show that sustained and predictable public investment remains foundational for irrigation development, while complementary financing models can enhance efficiency, scale, and sustainability when aligned with institutional capacity and farmer affordability. No single financing model is universally optimal; successful irrigation outcomes depend on coherent integration of financing instruments within broader agricultural and food system policies. In Kenya, the study finds that irrigation constraints are primarily institutional and financial rather than technical, reflecting fragmented financing, weak cost recovery, and limited private participation. The study recommends that Kenya should adopt a diversified and integrated irrigation financing framework anchored in strong public leadership, strategic use of PPPs, catalytic blended finance, support for farmer-led irrigation, and expanded access to climate finance. Such an approach is essential for accelerating irrigation development, strengthening food security, and enhancing climate resilience.
