Which MBTI Types Are Most Likely to Have Autism or ADHD?

The short answer

On the personality-trait evidence, autism lines up with the introverted, systemizing types — ISTJ and ISTP on the Big Five trait signature, and INTP and INTJ on the systemizing cognitive style — while ADHD lines up with ENTP, ESTP, and Perceiving types more broadly. Both conditions also skew strongly Turbulent (-T) rather than Assertive. The research behind each is below.

How MBTI maps to the Big Five

The MBTI's four axes correspond almost exactly to four of the five major personality traits: Extraversion ↔ E/I, Openness ↔ N/S (Intuition = high openness), Agreeableness ↔ F/T (Feeling = high agreeableness), and Conscientiousness ↔ J/P (Judging = high conscientiousness) — a correspondence established by McCrae & Costa (1989). The fifth trait, neuroticism, is carried by the modern 16Personalities Identity axis: Turbulent (-T) = high neuroticism, Assertive (-A) = low neuroticism. With that piece added, MBTI maps onto the full five-factor model — which is what lets us read the clinical trait research directly onto type.

Autism spectrum

The trait signature. A meta-analysis of Big Five traits in autism spectrum disorder found autistic individuals score lower on extraversion (the largest effect), agreeableness, conscientiousness, and openness, and higher on neuroticism. Follow-up work shows that same profile predicts how strongly autism symptoms present from person to person.

The types. Translate each trait: low extraversion → Introversion (I), low agreeableness → Thinking (T), low openness → Sensing (S), high neuroticism → Turbulent (-T). That combination points directly at ISTJ-T and ISTP-T. ISTJ matches the autistic pull toward routine, predictability, literal precision, and well-defined procedure. ISTP matches the detached, systemizing, low-affect style — absorbed in how things work, sparing with emotional expression, most at ease in solitary, hands-on focus. Both are introverted Sensing-Thinking profiles, which is exactly where the trait signature lands.

INTP and INTJ via the systemizing axis. The other strong autism association runs through cognitive style. Baron-Cohen's empathizing–systemizing research — tested in a sample of roughly half a million people — finds autistic individuals score markedly higher on systemizing, the drive to analyze and build rule-based systems. That orientation is the defining trait of the analytical Intuitive-Thinking types, which is why INTP and INTJ are so consistently associated with autism: their model-building, pattern-obsessed, Thinking-led wiring is the personality expression of a high-systemizing mind. In their Turbulent (-T) form they round out the four MBTI types most associated with the autistic profile, alongside ISTJ and ISTP.

ADHD

The trait signature. Across the five-factor literature, including a meta-analytic review of adult ADHD, the strongest and most consistent marker is low conscientiousness (driven by the inattentive symptoms), with low agreeableness (tied to hyperactivity and impulsivity) and high neuroticism alongside it.

The types. Low conscientiousness → Perceiving (P) — and conscientiousness is the one trait the MBTI measures head-on, as the Judging–Perceiving axis, which makes this the cleanest mapping of the two. Low agreeableness → Thinking (T); high neuroticism → Turbulent (-T). The result points to ENTP-T and ESTP-T, and to Perceiving types over Judging types more broadly.

The corresponding Enneagram types

Autism → Type 5, the Investigator. Withdrawn, cerebral, and privacy-guarding, the Type 5 conserves energy for a few deep interests and minimizes emotional and social demands — the same inward, systemizing pull seen in the autistic trait profile. Type 1's rule-bound precision and need for order is a secondary fit.

ADHD → Type 7, the Enthusiast. Novelty-hungry, easily bored, and future-focused, the Type 7 starts far more than it finishes — the restless, stimulation-seeking pattern that mirrors ADHD's low-conscientiousness core. The impulsive, action-first Type 8 is a secondary fit for the hyperactive presentation.

Sources

• McCrae & Costa (1989), Journal of Personality — the four MBTI axes map onto four of the Big Five traits. PubMed
• 16Personalities — the Assertive–Turbulent (Identity) scale corresponds to neuroticism, completing the five-factor map. 16personalities.com
• Meta-analysis of Big Five personality traits in autism spectrum disorder (2019), Autism. PubMed
• Greenberg, Baron-Cohen et al. (2018), PNAS — autistic people score higher on systemizing (Empathizing–Systemizing theory), in a sample of ~half a million. PubMed
• Five-factor model and the variability of autism symptom expression (2015), Journal of Autism and Developmental Disorders. PubMed
• Five-factor model personality traits relate to adult ADHD (2017), Psychiatry Research. PubMed
• Adult ADHD and emerging models of maladaptive personality: a meta-analytic review (2021). PubMed