Technical Abstract: The objective of this study was to determine species composition and abundance of stink bugs (Heteroptera: Pentatomidae) and their natural enemies in alfalfa, Medicago sativa L., in Georgia. Six species of phytophagous stink bugs, Nezara viridula (L.), Euschistus servus (Say), Thyanta custator custator (F.), Euschistus quadrator (Rolston), Oebalus pugnax pugnax (F.), and Chinavia hilaris (Say), and one predatory species, Podisus maculiventris Say, occurred in alfalfa. N. viridula was the predominant stink bug species over all 3 yrs of the study. Generally, density of this stink bug was high in seeding alfalfa in the late spring-early summer, and parasitization of this stink bug by Trichopoda pennipes (F.) could reach high levels as density of the pest built-up in the crop. E. servus and T. c. custator together comprised the second most predominant group of stink bugs in this crop. Alfalfa is a reproductive host for N. viridula and E. servus, and perhaps for T. c. custator, based on seasonal occurrence of nymphs (all five instars) and adults, nymphal development time, ovarian development time, and reproductive status (N. viridula only) of adults. Mainly adults of E. quadrator, O. p. pugnax, and C. hilaris were found in the crop. Geocoris spp., Orius insidiosus (Say), spiders, lady beetles, nabids/reduviids, and ants were stink predators collected from the crop. Alfalfa could possibly be managed to serve as a trap crop for both early and late season crops and as a source of nectar to stink bug parasitoids and insect pollinators on the farm.