The International Society for Affective Disorders is an international psychiatric organisation based in south London that researches mood disorders.It was formed in February 2004.
It represents affective disorders for the World Psychiatric Association (WPA, in Paris). It produces its journal, the Journal of Affective Disorders. It researches chronotherapeutics, and subjects such as winter blues, which can cause large disorders in mood.
It holds the ISAD biennial conference.
It is headquartered in the London Borough of Southwark, at the Institute of Psychiatry, Psychology and Neuroscience (IoPPN, previously known as the Institute of Psychiatry) at King's College Hospital in Denmark Hill, on the A215 close to the boundary with the London Borough of Lambeth.