The influence of soybean seed protein and oil level on developmental time, weight, and survival of southern green stink bug,Nezara viridula(L.), was examined. Developmental times and weights of adults and nymphs were similar to those reported by other researchers. Diet had a small but significant effect on developmental time to second, third, and fourth instar, with consumption of higher protein (lower oil) resulting in decreased developmental time (e.g., days to fourth instar = 13.3 on high protein diet compared with 15.2 on low protein diet). However, developmental time from hatch to fifth instar and adult was not significantly affected by diet. Maximum differences between diets at any life stage were only 2 d. Males and females had similar developmental times. Increasing seed protein resulted in greater adult weights of both males and females (e.g., weight of females = 182.2 mg on high protein diet compared with 153.0 mg on low protein diet) but had no effect on weights of nymphs. Females were significantly heavier than males from fourth instar to adult. Stink bug genotype (blocks) significantly affected developmental time and weight of all nymphal instars and adults. Survival was not affected by diet or stink bug genotype.