Parent training can help support the development of communication skills for young children with complex communication needs (CCN). Online delivery of such training may alleviate some of the burden on families, thereby increasing participation and outcomes. To determine the effectiveness of online parent training in communication partner strategies, a single-subject, multiple-probe design study was conducted with four parents and their children with developmental disabilities and CCN. Parents completed an interactive online training and then participated in live sessions to demonstrate trained skills. Results indicate that online parent training resulted in higher levels of communication opportunities provided by parents to their children with CCN. Increases were also noted for child communication and responses provided by parents to child communication. Results varied for participants. Parent evaluations of the training, limitations, and future research directions are discussed.