Bertrand I. Halperin (born December 6, 1941) is an American physicist, former holder of the Hollis Chair of Mathematicks and Natural Philosophy at the physics department of Harvard University.

His paternal grandmother's family the Maximovs claimed descent from Rabbi Israel Baal Shem Tov (BeShT).

In the 1970s, he, together with David Robert Nelson, worked out a theory of two-dimensional melting, predicting the hexatic phase before it was experimentally observed by Pindak et al.

[8] In 2003, he was awarded the Wolf Prize in physics for his work on "two- dimensional melting, disordered systems and strongly interacting electrons", the other half went to Anthony James Leggett.

[10] In 2018, he was awarded the 2019 APS Medal for Exceptional Achievement in Research,[3] for "his seminal contributions to theoretical condensed matter physics, especially his pioneering work on the role of topology in both classical and quantum systems.