John Leask Lumley (4 November 1930 – 30 May 2015) was an American fluid dynamicist and a professor at Cornell University.

He started his academic career at the Pennsylvania State University where he became Evan Pugh Professor of Aerospace Engineering.

In 1977 Lumley joined Cornell University where he was the Willis H. Carrier Professor of Mechanical and Aerospace Engineering (Emeritus) until his death in May 2015 of brain cancer.

[1][4] He was an editor of the Annual Review of Fluid Mechanics from 1977 to 2002.

[5] Lumley received the 1990 Fluid Dynamics Prize of American Physical Society, "For his outstanding contributions to the understanding of turbulent flow, in particular, the fundamental structure of turbulent shear flows, the effects of drag-reducing additives, and his widely recognized contributions to the statistical theory of turbulence, and for his personal and intellectual leadership in the international fluid dynamics community, including his educational films and books, and his long active devotion to the Division of Fluid Dynamics of The American Physical Society.