National Day

National Multiple Personality Day

Celebrated on 03/05/2026

Quick Fact

National Multiple Personality Day, observed on March 5th, was established to raise awareness about dissociative identity disorder (DID), formerly known as multiple personality disorder. It is estimated that 1.5% of the global population may have DID, though many cases go undiagnosed. The holiday encourages understanding and destigmatization of this complex condition.

Origins and Establishment of National Multiple Personality Day

National Multiple Personality Day was first observed in the early 2000s, though its exact origin is unclear. It was likely started by mental health advocates and organizations such as the International Society for the Study of Trauma and Dissociation (ISSTD) to promote awareness of dissociative identity disorder (DID). The date March 5th was chosen to coincide with the release of the book "Sybil" (1973) or the film adaptation (1976), which brought public attention to the condition. The holiday aims to educate the public about DID, its symptoms, and the trauma that often underlies it.

Evolution and Modern Commemoration

Over time, National Multiple Personality Day has evolved from a niche observance to a more widely recognized day within mental health communities. In recent years, the focus has shifted from the outdated term "multiple personality disorder" to the current diagnosis "dissociative identity disorder" (DID) as per the DSM-5. Modern commemorations include online campaigns, educational webinars, and social media discussions using hashtags like #NationalMultiplePersonalityDay and #DIDAwareness. Many organizations provide resources for those with DID and their families, emphasizing trauma-informed care and support.

Facts & General Observations

  • DID is believed to affect approximately 1.5% of the population worldwide, a prevalence similar to that of schizophrenia.
  • The condition is often misrepresented in media, with only about 1% of portrayals being accurate according to mental health professionals.
  • Up to 99% of individuals with DID report a history of severe childhood trauma, such as abuse or neglect.

Explore more celebrations, trivia, and quests on National Day Quest.