National Multiple Personality Day | March 5
(Last Updated On: February 27, 2023)


National Multiple Personality Day on March 5th has two separate approaches to recognizing this day. 


The first strategy takes an inward examination of our own personalities. This approach sees the day as a way to explore personality traits and examining the roots of those traits. Each one of us shows a different side of our characters at other times and in different places. Sometimes our personalities appear to be altered, depending on whom we are with and what we are doing. With these things in mind, the day focuses our thoughts on our own personality traits. 

The other view of the observance aims to raise awareness of the disorder. Multiple Personality Disorder is better known as Dissociative Identity Disorder (DID). It is characterized by at least two distinct and relatively enduring identities or dissociated personality states that alternately control a person’s behavior. Someone with DID will experience memory impairment for important information not explained by ordinary forgetfulness. While the disorder affects less than .1 to 1 percent of the population, its impact is profound for that community and their family. The continued need for treatment, support, and research remains. 


While there are two ways to approach this day, you can choose to recognize both.

  • Start by exploring your personality traits. T
  • ake a personality test and learn more about your personality.
  • Invite a friend to take the test with you and compare your results.
  • Learn more about Dissociative Identity Disorder. Please find out how it affects a person and how it is treated.
  • Attend a seminar or read up about the disorder.
  • Show support for those with the disorder by sharing your newfound understanding.
  • Use #MultiplePersonalityDay to post on social media.


National Day Calendar continues to research the origins of this multi-faceted day. 

Multiple Personality FAQ

Q. How common is dissociative identity disorder?
A. Dissociative identity disorder (DID) is rare. It affects less than 1% of the population.

Q. What are some signs of DID?
A. Only a doctor can diagnose DID, and it can be difficult to diagnose. Visit the National Alliance on Mental Illness (NAMI) for more information.

March 5th Celebrated  History


An incident involving British troops firing into a gathering mob in Boston kills five Americans including Crispus Attucks. Known as the Boston Massacre, the event would raise tensions among colonists and increase resistance to the Crown. Five years later, the Revolutionary War began.


The U.S. Patent Office issued patent no. 124,405 to George Westinghouse Jr. for his “Improvement in Steam-Air Brakes” for use on steam-powered locomotives.


Test pilot Captain Joseph Summers flies the Supermarine Spitfire on its maiden flight. Reginald J. Mitchell designed the British propeller aircraft.


The Piper PA-24 Comanche aircraft carrying country singers Patsy Cline, Cowboy Copas, Hawkshaw Hawkins, and pilot Randy Hughes crashed 90 miles outside of Nashville, Tennessee, killing all on board.

March 5th Celebrated Birthdays

Étienne-Jules Marey – 1830

The French scientist studied human and natural movement. He made many developments in photography to capture movement including a sphygmograph and chronophotograph that were predecessors to the motion picture camera.

Emmett Culligan – 1893

In 1936, Emmett Joseph Culligan and his brothers John and Leo Culligan founded Culligan Zeolite Company.

Momofuku Ando – 1910

In 1958, the Taiwanese-Japanese inventor founded Nissin Food Products Co., Ltd. He is the inventor of Chicken Ramen, the first instant ramen.

Geraldyn “Jerrie” Cobb – 1931

At 16-years-old, Jerrie Cobb earned her pilot’s license. By the age of 21, she was flying internationally. In 1959, she was one of thirteen women selected to completed Mercury astronaut training. Cobb completed all three phases, however, all 13 women would be denied any opportunity to fly as part of a NASA mission.

Lynn Margulis – 1938

The evolutionary biologist is best known for her symbiotic theory of evolution. She published the theory in Origin of Eukaryotic Cells and in Symbiosis in Cell Evolution.

Leslie Marmon Silko – 1948

In 1980, the Laguna Pueblo author earned the American Book Award for her novel Ceremony. Some of her other works include Storyteller, Almanac of the Dead, Gardens in the Dunes and Yellow Woman.

Penn Jillette – 1955

The American magician, illusionist, and comedian has been performing since 1975 with his silent partner, Teller.

Notable Mentions

Howard Pyle – 1853
Eliza Blaker – 1854
Rosa Luxemburg – 1871
Michael Warren – 1946
Andy Gibb – 1958

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