László Tisza (July 7, 1907 – April 15, 2009) was a Hungarian-born American physicist who was Professor of Physics Emeritus at MIT.

He was a colleague of famed physicists Edward Teller, Lev Landau and Fritz London, and initiated the two-fluid theory of liquid helium.

[1] In 1941, Tisza immigrated to the United States and joined the faculty at the Massachusetts Institute of Technology.

His research areas included theoretical physics and the history and philosophy of science, specifically on the foundation of thermodynamics[2] and quantum mechanics.

He was a Fellow of The American Physical Society and American Academy of Arts and Sciences, a John Simon Guggenheim Fellow and had been a visiting professor at the University of Paris in Sorbonne.