This study examined the effect of child temperament, symptom severity, verbal ability and level of functioning on maternal stress in 43 Greek mothers of children and young people with autism spectrum disorder. Symptom severity was assessed by the CARS, level of functioning by the PEP, temperament by the Dimensions of Temperament Scale (DOTS-R) and maternal stress by the Clarke Modification of Holroyd's Questionnaire on Resources and Stress (QRS). Lower-functioning children and those with high activity level, low flexibility and low mood scores were perceived to be more stressful. Counter to expectation, children with ASD who were rated high on rhythmicity and task orientation were perceived as more stressful. Best predictors of maternal stress were high activity level, low mood and high symptom severity. Mothers of non-verbal children were more stressed than those of verbal. The relevance of child temperament for understanding maternal stress is discussed with particular relevance to the Greek culture and available supports. (Contains 5 tables.)