The study was conducted in Bijapur district of Karnataka state during 2008-09 to gain insights into impact of post-harvest losses of grapes on market intermediaries. The study is based on primary data obtained from 10 wholesalers 10 pre- harvest contractors and 10 retailers. The data were collected by personally contacting them using interview schedules. The data were analysed using descriptive statistics. The study revealed that losses during post-harvest stage occurred to an extent of over 25 per cent from producer-consumer. The post-harvest losses during successive stages of marketing have resulted in substantial revenue losses to market intermediaries viz., pre-harvest contractor (2.46% ), wholesaler (2.07%), and retailer (7.71 %),. The post harvest losses when internalized has lead to increased cost of marketing to the tune of ` 342, ` 298 and ` 510 respectively in case of pre-harvest contractor, wholesaler and retailer. The study proved that the margins of intermediaries have reduced in varying degrees. The marketing efficiency was highest in case of marketing channel involving wholesaler ensuring fair returns to producer.