There is a vast body of research exploring the myriad ways design can contribute to business success. For example, businesses seeing to generate new products, services, processes, models, and strategies as part of their efforts to innovate often turn to design for support and leverage. But how clearly have scholars defined the relationship between design and innovation? Is it even possible to explain the connection between the two? In this article, we investigate whether the design literature published over the past thirty years contains an answer to these questions. We organize our findings into clusters describing the key roles that design activity plays in the innovation process, how designers personally play a part, and the internal and external factors that contribute to design/innovation associations. We also introduce the notion that design language—be it visual, methodological, or procedural—has become not only an organizing principle that supports innovative initiatives, it has become the language of innovation itself.