Macrocybe is a genus of fungi in the family Tricholomataceae. The genus contains seven species, widely distributed in tropical regions worldwide. The genus was established in 1998 by mycologists David Pegler and Deborah Jean Lodge, for several large white tropical species that had been placed in the genus Tricholoma. The name is derived from the Ancient Greek words makros "long" and kube "head". The genus is related to the genus Calocybe.