Agricultural extension services are essential for improving yam production and reducing post-harvest losses in Tarka Local Government Area (LGA), Benue State. This study evaluated the nature of extension services provided to yam farmers and examined their effects on reducing post-harvest losses. Using a cross-sectional survey design, data were collected from 400 yam farmers through structured questionnaire and key informant interviews. Quantitative data were analysed using descriptive statistics, while qualitative data were subjected to content analysis. Findings revealed that extension services in Tarka LGA include technical training on planting, weeding, and post-harvest handling, provision of farm inputs, market information, and support for cooperative formation. These services improved harvesting practices, packaging, transportation, storage, and overall yam quality, contributing to reduced post-harvest losses. The study concludes that extension services positively influence yam production and post-harvest management, though coverage and consistency remain limited. Recommendations include regular farmer training, increased extension outreach, strengthened cooperative support, and improved access to inputs and market information to further enhance post-harvest loss reduction.