Tourism literature is awash with evidence of the value of domestic tourism to the tourism industry in general. However; there is limited knowledge of how domestic tourism is contributing towards sustainable tourism development especially in developing countries. This study explored the contribution of domestic tourism to sustainable tourism development in Zimbabwe, one developing country in Southern Africa. Using qualitative methodologies, data were collected and thematically analysed. The study revealed that domestic tourism has both positive and negative contributions to sustainable tourism development in unique ways. In conclusion, it was noted that without domestic tourism, Zimbabwe as a tourism destination would be struggling to grow its tourism product offering and expand its market share on the global tourism market.