Waldo LaSalle Schmitt (June 25, 1887 – August 5, 1977) was an American biologist born in Washington, D.C.

He received his Ph.D. from George Washington University in 1922.

In 1948, he received an honorary Doctor of Science degree from the University of Southern California.

Schmitt's primary field of zoological investigation was carcinology, with special emphasis on the decapod crustaceans (crabs, lobsters, shrimp, and so on).

His bibliography consists of more than seventy titles.