The effectiveness of an extension organization can be defined as how well it performs its activities to attain the pre-determined objectives. In this present context KVKs are a key organization for transfer of technology based advisory services to the farmers at district level. The present study was conducted purposively in Chhattisgarh state, with a view to evaluate perceived effectiveness of Krishi Vigyan Kendra by the beneficiary farmers in utilization and accessibility of extension service delivery. Chhattisgarh comprises of three agro-climatic zones, out of that one district were selected randomly from each agro-climatic zones. From each selected district, 40 KVK beneficiary farmers were selected randomly which constitute a total sample size of 120. An ex-post facto research design was used for this study. The effectiveness of the extension organization (KVK) in technology advisory and delivery services was measured by effectiveness index developed for this purpose. The extension services rendered by KVK were found to be medium and low in effectiveness by majority (39.17%) of the farmers. About 11.70 percent of the farmers found the extension services is highly effective, with a mean effectiveness of 41.19±14.36. Extension services rendered by KVK were found to be medium in effectiveness by major share of the farmers followed by low in effectiveness. KVKs is the key institutions at the district level for transfer of technologies leading to a transformation of the agricultural and allied sector in the country. The constant extension and advisory support in addition leads to better adoption of technologies which further leads to increase in yield and income and ultimately satisfaction of the farmers towards the extension service.