This study examines the evolving livelihood patterns in Chamoli district, Uttarakhand, and evaluates the role of Non-Governmental Organisations (NGOs) in facilitating rural transformation in mountain communities. Using a mixed-method approach, primary data were collected from 100 households across two blocks through structured questionnaires, focus group discussions, and key informant interviews. The research reveals a shift from traditional agriculture-based livelihoods, with households dependent solely on agriculture declining from 58 % to 23 % over the past decade. Currently, 67% of households engage in multiple income-generating activities, demonstrating significant diversification of their livelihood strategies. NGO interventions have been instrumental in this transformation. The majority of households, 52 % of households have benefited from various programs. Skill development training reached 73 % of the beneficiaries among the surveyed population. The mean monthly household income stands at INR 22,350, with educated households showing significantly higher diversification rates. Key challenges include limited market access, insufficient technical knowledge, and climate change impacts. The study recommends enhanced coordination between NGOs and government agencies, improved market linkages, and climate-resilient livelihood strategies for sustainable mountain development. These findings contribute valuable insights for designing effective development interventions in similar mountain regions.