Background: In low- and middle-income (LAMI) countries, there is a lack of well-trained therapists to provide specialist interventions for children with intellectual disabilities and their families. We sought to identify strategies deliverable by families or non-specialist workers. Materials and Methods: After searches of appropriate scientific databases, we applied GRADE methodology to rate the quality of evidence for these interventions. Results: We identified small-scale interventions trialled in LAMI countries with limited evidence of effectiveness in supporting development, adaptive behaviour and/or community participation. In high-income countries, the Stepping Stones Triple P program for adaptive behaviour and the Portage program for child development have the most extensive evidence base and may be applicable in LAMI countries. Conclusions: There is reason to hope that, when combined with community development strategies, the welfare of children with intellectual disabilities in LAMI countries can be advanced within those countries' economic means.