Farmer Producer Organizations (FPOs) have emerged as an important institutional mechanism for improving the socio-economic conditions of small and marginal farmers through collective action, enhanced market access, and improved bargaining power. The present study examines the impact of the Nallabelli Farmers Producer Company Limited on farmers' income and marketing efficiency in Telangana. The study is based on both primary and secondary data. Primary data were collected from 60 randomly selected member farmers out of 350 active members of the FPO through a structured interview schedule. Secondary data were obtained from government reports, NABARD publications, SFAC reports, journals, and other relevant sources. The findings reveal that the majority of the respondents are small and marginal farmers with considerable farming experience. The FPO has significantly improved access to quality inputs, institutional credit, insurance, training, and market information. A large proportion of respondents reported improvements in yield, cropping intensity, gross income, net income, marketable surplus, and price realization after joining the FPO. However, the members continue to face challenges such as inadequate working capital, poor infrastructure, lack of storage facilities, price fluctuations, low awareness, and limited digital literacy. The study concludes that FPOs play a crucial role in enhancing farmers' income and marketing efficiency. Strengthening financial support, infrastructure facilities, technology adoption, and institutional linkages would further improve the effectiveness and sustainability of FPOs.