Jan Aleksander Rajchman (10 August 1911 – 1 April 1989) was a Polish-American electrical engineer and computer pioneer.
He was born in London, where his parents temporarily lived, and where his father held various positions at the Royal Institute of Public Health and King's College.
He received the Diploma of Electrical Engineering from the Swiss Federal Institute of Technology in Zurich in 1935, and became a Doctor of Science in 1938.
He is also a member of Sigma Xi, the Association for Computing Machinery (ACM), the Physical Society, the New York Academy of Sciences, and a Fellow of the American Association for the Advancement of Science and the Franklin Institute.
He received the 1960 IEEE Morris N. Liebmann Memorial Award and the 1974 IEEE Edison Medal For a creative career in the development of electronic devices and for pioneering work in computer memory systems.