''Mycena leaiana'', commonly known as the orange mycena or Lea's mycena, is a species of saprobic fungi in the genus ''Mycena'', family Mycenaceae. Characterized by their bright orange caps and stalks and reddish-orange gill edges, they usually grow in dense clusters on deciduous logs. The pigment responsible for the orange color in this species has antibiotic properties. A variety of the species, ''Mycena leaiana'' var. ''australis'', can be found in Australia and New Zealand.