Károly Rezso Soó von Bere (1 August 1903, Székelyudvarhely (now Odorheiu Secuiesc, Romania) – 10 February 1980, Budapest) was a Hungarian botanist and professor at the University of Budapest.
He is best known for his work on:
Dactylorhiza cruenta (O.F.Müller) Soó (1962)
Dactylorhiza elata (Poiret) Soó (1962)
Dactylorhiza foliosa (Sol.