The effects of a socially interactive robot on the vocalization production of five children with disabilities (4 with autism, 1 with a sensory processing disorder) were the focus of the intervention study described in this research report. The interventions with each child were conducted over 4 or 5 days in the children's homes and involved investigator-facilitated robot-produced speech and movements to engage the children in child-robot and child-mother interactions. Results showed that for the children as a group and for 4 of 5 children individually, the children's vocalization production increased from a nonintervention, baseline condition to the intervention phases of the study. The utility of socially interactive robots for intervening with young children with disabilities is described. The following is appended: Professionally Recorded Sounds and Speech Used in the Vocalization Production Study.