Technical Abstract: Entomopathogenic fungi for the management of insect pests have been steadily gaining popularity in the last 50 years. Each year, more and more fungi are being commercialized all over the world for inundative application as mycoinsecticides, and some developed for inoculative release, as appreciation for their human and environmental safety increases along with concerns about the adverse impacts of chemical insecticides. Inundative use requires production of very large numbers of the infectious stages of these spores – aerial conidia, blastospores, submerged, (microcycle) conidia, marcescent mycelium and microsclerotia. Considerable advances in mass production have occurred in response to the increasing popularity. This chapter examines the “state of the art” of fungus mass production, particularly during the past 30 years.