This paper is a review of some experiments using B black S soldier F fly (BSF) and its byproduct to explore their nutritional value, production potential in Indonesia and its application in the ration of ruminants. Evaluation on the effect of milk replacer, creep feed containing BSF, BSF frass and the possibility to use lactic acid bacteria from BSF as probiotics are presented.Utilization of BSF larvae in milk replacer as skim and cream milk substitute showed that there were similarity on physiological, hematological status and performance of goat kids compared to those offered goat milk or commercial milk replacer. In addition, BSF larvae can be used to substitute soybean meal in the creep feed for post weaning goat kids without any differences in weight gain and blood profiles. However, utilization of BSF frass in the fattening goat ration resulted lower digestibility of dry matter and organic matter due to the chitin content in the frass. Black soldier fly SF larvae grown on chicken manure harbour lactic acid bacteria and potential as probiotic candidates for ruminant. In general, BSF larvae is potential to be used as ingredient for milk replacer, creep feed, fattening ration, and source of lactic acid bacteria for probiotics.