Crop diversification is an important strategy for improving livelihood security in fragile hill ecosystems. It involves the integration of multiple crops and enterprises to enhance productivity, reduce risk, and ensure sustainability. In hill regions, where agriculture is constrained by small landholdings, climatic variability, and limited resources, diversification plays a crucial role in stabilizing income and improving resilience. Empirical studies indicate that diversified farming systems enhance resource-use efficiency, increase farm income, and reduce vulnerability to climate change.