Paul Ichiro Terasaki (Japanese: 寺崎一郎, September 10, 1929 – January 25, 2016) was an American scientist in the field of human organ transplant technology, and professor emeritus of surgery at UCLA School of Medicine.

Later he earned his bachelor's, master's, and doctorate in zoology all from UCLA and was appointed to the medical school faculty.

[1] In 1964, Terasaki developed the microcytotoxicity test, a tissue-typing test for organ transplant donors and recipients that required only 1 microliter each of antisera used to identify human leukocyte antigens (HLA).

[3] He and his corporation, One Lambda, have played a central role in the development of tissue typing and transplantation surgery.

In 1999, he retired from UCLA, but within a year resumed his academic pursuits with the creation of the Terasaki Foundation, a research center dedicated to cancer immunotherapy and the study of humoral immunity and transplantation.