The OHDI Training Guide on Hen Welfare and Cage-Free Farming is a practical resource developed to build the knowledge and capacity of poultry farmers, extension agents, and animal welfare advocates on humane, sustainable egg production systems. The guide provides step-by-step insights into cage-free housing design, bird management, nutrition, health, and welfare assessment. It also emphasizes the importance of transitioning from conventional caged systems to welfare-friendly models that improve productivity, ensure food safety, and promote the wellbeing of both farmers and hens. Designed with illustrations, examples, and best practices, this manual serves as a foundational tool for training and field application across Nigeria’s growing poultry sector.