This report documents the program and the outcomes of the Dagstuhl Seminar 14412 "Globalizing Domain-Specific Languages" held in October 2014. Complex, data-intensive, cyper-physical, cloud-based etc. systems need effective modeling techniques, preferably based on DSLs to describe aspects and views. Models written in heterogeneous languages however need to be semantically compatible and their supporting individual tools need to be interoperable. This workshop discusses possible and necessary forms of interoperation their benefits and drawbacks and in particular whether there is a general pattern on coordination, composition and interoperation possible. Main goal was to establish a research programme towards such techniques