En no Ozunu, also En no Ozuno, Otsuno was a Japanese ascetic and mystic, traditionally held to be the founder of Shugendō, the path of ascetic training practiced by the gyōja or yamabushi.
He was banished by the Imperial Court to Izu Ōshima on June 26, 699, but folk tales at least as old as the Nihon Ryōiki recount his supernatural powers and exploits.
He also referred to by the name En no Gyōja, En no Ubasoku, or under the full name En no Kimi Ozunu, where Kimi is his kabane or titular name.