Secrecy is a common component of many religions and has recently become the subject of scholarly inquiry. Drawing from a wide variety of scholarly sources, ranging from a sociological study to ethnographic research on a little known Afro-Brazilian tradition, this paper seeks to combine existing views of secrecy to examine the phenomenon of religious secrecy as it applies to Esoteric Buddhism. I begin with conceptualizing of secrecy as a human construct, discuss the view that the secret is divine and thus inherently "mysterious," and finally propose my own unique theory which suggests secrecy in Esoteric Buddhism can be best understood as "unintelligibility."