Michael Darwin Morley (September 29, 1930 – October 11, 2020) was an American mathematician.

At his death in 2020, Morley was professor emeritus at Cornell University.

Morley's formal PhD advisor at the University of Chicago was Saunders Mac Lane, but he completed his thesis under the guidance of Robert Vaught at the University of California, Berkeley.

[1] Morley received the 2003 Leroy P. Steele Prize for Seminal Contribution to Research from the American Mathematical Society for his 1965 paper "Categoricity in Power".

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