Tamaki Saitō (斎藤 環, Saitō Tamaki, born September 24, 1961) is a Japanese psychologist and critic.
Saitō is Director of Medical Service at Sofukai Sasaki Hospital in Funabashi, Chiba.
[1] Saitō is notable for his study of hikikomori, a term he coined;[2] he is internationally recognized as Japan's leading hikikomori expert.
In 1980, he graduated from Morioka First High School and matriculated into the University of Tsukuba the same year; graduating in 1986 from the medical faculty with a specialization in Environmental Ecology.
In 1990, he completed a doctoral course in medicine under the leadership of Hiroshi Inamura.