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Shin'ichi Hisamatsu (久松 真一, Hisamatsu Shin'ichi, June 5, 1889 – February 27, 1980) was a philosopher, Zen Buddhist scholar, and Japanese tea ceremony (sadō or chadō, 茶道, "the way of tea") master. He was a professor at Kyoto University and received an honorary doctoral degree from Harvard University.
Hisamatsu was born in Gifu Prefecture, Japan. He entered Kyoto University in 1912 and studied philosophy with Kitarō Nishida, one of the most prominent Japanese philosophers of his time and the author of An Inquiry into the Good. With Nishida’s recommendation, Hisamatsu joined the Rinzai Zen monastery of Myōshin-ji in Kyoto in 1915 and studied Zen Buddhism with Zen Master Ikegami Shōsan. After his monastic life at Myōshin-ji, he established his original philosophical view, which consists of both Eastern (mainly Zen Buddhist) and Western philosophy. Shortly after that, Hisamatsu received a doctorate degree from Kyoto University.
Between 1943 and 1949, he taught philosophy and religious studies at Kyoto University. While in Kyoto, Hisamatsu frequently discussed Zen Buddhism and philosophy with D.T. Suzuki at Shunkō-in, where he lived. He also became the teacher of Masao Abe.
Hisamatsu was a founder of the FAS Society.
 The FAS Society’s origin, Gakudō Dōjō, was established by students of Kyoto University under Hisamatsu's guidance. In 1960, Gakudō Dōjō was renamed FAS Society for their international activities. The purpose of this society is to spread the standpoint of the fundamental self-awakening of all mankind.
In the Netherlands and Belgium the message of Hisamatsu is kept alive by Zen teacher Ton Lathouwers.
- FAS is not an acronym, but stands for "F" the Formless self, "A" for taking the standpoint of All humankind, and "S" for creating Suprahistorical history. "Introduction to FAS". Fas.x0.com. Retrieved 2015-04-07.
- Shinichi Hisamatsu (2002), Zen Talks On The Record Of Linji. Hisamatsu's Talks on Linji. University of Hawaii Press. ISBN 978-0-8248-2384-9