Klaus Halbach (February 3, 1925 – May 11, 2000) was a German-born American applied physicist, engineer and inventor, who was a staff scientist at Lawrence Berkeley National Laboratory.

His PhD studies concerned the newly-emerging area of nuclear magnetic resonance; his work brought him into contact with Felix Bloch, who received 1952 Nobel Prize in Physics for his contributions to this field.

[2] In 1957, he came to the United States under a Swiss National Science Foundation grant to work at Stanford University as a research associate under Bloch.

[1][4] Halbach and his colleague and son-in-law Ron Holsinger developed the widely-used POISSON package of simulation software for magnetic system design.

[9] Despite his official retirement from Lawrence Berkeley National Laboratory in 1991, he continued his research on magnet design and trained students in his field.