Inoue Enryō (井上円了?, March 18, 1858 – June 6, 1919) was a Japanese philosopher, Buddhist reformer, educator, and royalist. A key figure in the reception of Western philosophy, the emergence of modern Buddhism, and the permeation of the imperial ideology during the second half of the Meiji Era. He is the founder of Toyo University and the creator of Tetsugaku-dō Park 哲学堂公園 in Tokyo. His Mystery Studies opposing superstition made him known as Ghost Doc or Doctor Specter お化け博士.
Born in a village close to Nagaoka in today's Niigata Prefecture, he was ordained as a priest in the Ōtani Branch 大谷派 of Shin Buddhism 真宗 at the age of 13. As the oldest son, he was brought up to inherit the ministry of his father's parish temple. His early education included the Chinese classics and Western subjects like geography and English. In 1878, his Buddhist order sent him to Tokyo in order to study at Japan's first modern university. Before entering Tokyo University in 1881 Inoue received additional secondary education in English, history, and mathematics in the university's Preparatory School.
Registering for philosophy as single major at Tokyo University first became possible in 1881. Inoue was the first and only student in 1881 to do so. As a student, Inoue initiated Japan's first Society of Philosophy (1884). On the occasion of his graduation in 1885, he created a Philosophy Ceremony 哲学祭 that commemorated Buddha, Confucius, Socrates and Kant as the Four Sages of world philosophy. In 1887, he set up a Philosophy Publishing House 哲学書院, edited the first issue of the Journal of the Philosophy Society『哲学会雑誌』and founded the Philosophy Academy 哲学館, the predecessor of today's Toyo University 東洋大学. His early works Epitome of Philosophy『哲学要領』(1886/86) and Outline of Ethics『倫理通論』(1887) are the first Japanese introductions to philosophy in East and West.