The Autism-Spectrum Quotient Test (abbreviated to AQ) is a diagnostic questionnaire designed to measure the expression of Autism-Spectrum traits in an individual, by his or her own subjective self-assessment.

It was first published in 2001 by Simon Baron-Cohen and his colleagues at the Cambridge Autism Research Centre as part of the the widely cited study entitled The Autism Spectrum Quotient (AQ): Evidence from Asperger syndrome/high-functioning autism, males and females, scientists and mathematicians.