The first clearly described medical cases of autism date to the early 1940s, but historical descriptions of people who may have been autistic go back much further.

Quick Scoop

Earliest clearly diagnosed case

  • The first person formally diagnosed with autism was Donald Triplett , an American man whose childhood was described in a 1943 paper by child psychiatrist Leo Kanner.
  • Kanner called the condition “early infantile autism” and presented 11 children who shared traits like social withdrawal, unusual speech, and a strong need for sameness.
  • Triplett’s symptoms were noted as early as the late 1930s, but the actual medical description and diagnosis appeared in 1943 , which is why that year is usually treated as the starting point of autism as a distinct diagnosis.

Earlier possible cases (before the word “autism”)

  • In 1799 , French physician Jean-Marc Gaspard Itard wrote about a boy known as “Victor, the Wild Boy of Aveyron,” who had severe communication and social difficulties; some modern experts think he may have been autistic, but he was not diagnosed that way at the time.
  • In the early 1800s and early 1900s, other doctors described people with unusual social behavior and communication differences, but they did not use the term autism or distinguish it clearly from other conditions.

So, if you mean:

  • “First official autism diagnosis ” → 1943 (Donald Triplett in Leo Kanner’s paper).
  • “Earliest person who might have had autism in the historical record ” → at least as far back as the late 1700s (cases like Victor of Aveyron), but those are speculative and only interpreted that way by modern writers.

Why this matters today

Modern conversations about autism now emphasize that autistic people have always existed; it’s the recognition, language, and support that are relatively recent.

This history is part of why many advocates push for earlier diagnosis, better acceptance, and a shift from viewing autism purely as a “disorder” to understanding it as a neurodevelopmental difference across a spectrum of traits.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.