This study investigates pronoun reference and verbs with nonactive morphology in high-functioning Greek-speaking children with Autism Spectrum Disorders (ASD). It is motivated by problems with reflexive pronouns demonstrated by English-speaking children with ASD and the fact that reflexivity is also expressed via nonactive (reflexive) verbs in Greek. Twenty 5- to 8-year-old children with ASD and 20 vocabulary-matched typically developing controls of the same age range completed a sentence-picture matching, an elicitation, and a judgment task. Children with ASD did not differ from controls in interpreting reflexive and strong pronouns but were less accurate in the comprehension of clitics and omitted clitics in their production. The findings render clitics a vulnerable domain for autism in Greek, and potentially for other languages with clitics, and suggest that this could be a consequence of difficulties in the syntax-pragmatics or the syntax-phonology interface. The two groups did not differ in the comprehension of nonactive morphology but were less accurate in passive than reflexive verbs. We argue that this is likely to stem from the linguistic representation associated with each type of verb, rather than their input frequency.