Caregiver involvement plays a critical role in the development of communication in individuals with autism spectrum disorder (ASD) and intellectual/developmental disability (IDD). However, culturally and linguistically diverse (CLD) families usually do not receive sufficient culturally and linguistically appropriate support due to language and cultural barriers. The purpose of the present research was to review studies across cultures to summarize the characteristics of single-case studies on caregiver involvement in communication interventions for CLD families of individuals with ASD and IDD for recommendations on culturally responsive practices. The results suggested that caregiver involvement can improve communication skills in CLD individuals with ASD and IDD; however, there is a need to provide culturally and linguistically appropriate support to CLD caregivers during parent training. Limitations and implications for future research and practice were addressed.