recycling waste especially used frying oils is considered healthy and eco-friendly procedure. Considering as novel technique, molluscicidal activities were evaluated for two waste frying oils of sunflower and soybean baits against the glassy clover snail, Monarch cartesian (Müller) under laboratory and field conditions. Fresh oils of both were also tested. A promising result indicated that used frying oils of both sunflower and soybean exhibited potent mortality percentages after three weeks with 35 % concentration under laboratory conditions, where juvenile mortality for both used oils was 100 %, while adult mortality were 66.67, and 73.33 %, respectively. The lowest hatching % of M. cartesian was 41.98 for fresh soybean oil followed by 52.33, 57.48 and 60.78 % for used frying soybean oil, fresh and used sunflower oils, respectively. Similarly, field investigations estimated the residual effect of used frying sunflower and soybean oils on reduction percentages after three weeks were 55.32 & 57.39%, respectively with a concentration of 35 %. Compared to control, reductions in activities of amylase, invertase and trehalase enzymes in adults of M. cartesian treated with used frying soybean oil were recorded. In addition, physicochemical parameters (free fatty acids, acidity % and peroxide value) of fresh and used frying oil were measured.