Juanita Ollie Diffay Tate (November 23, 1904 – March 21, 1988) was an American economist and college professor.

Her father owned a large barber shop and was cashier of the Alabama Penny Savings Bank.

[3] She earned a master's degree from Howard University in 1950, with a thesis titled "An Early Economic Journal Ephemerides du Citoyen our Bibliotheque Raisonee des Sciences Morales et Politiques".

[7] In 1928, Diffay also earned a diploma from the Madame C. J. Walker Agents in Beauty Culture program in Birmingham.

[11] Jesse Jackson was one of Tate's students, and in 1977 he selected her to receive a Golden Key Award from the American Association of School Administrators, as an educator who influenced his life and work.