The European Federation of Autonomic Societies (EFAS) is an umbrella society founded in 1997 in London, UK.
EFAS hosts national autonomic societies (NAS), societies not exclusively specialised in autonomic nervous system research and private persons.
 
The aim is to establish a platform for scientists and clinicians with interests in ANS physiology, disorders and treatment. To promote the interdisciplinary communication a congress is organised by another NAS every year.