In recent decades, many higher education systems around the world have been exposed to institutional mergers. While the rationale for mergers has often been related to issues of improved quality, effectiveness and/or efficiency at the institutional level, fewer studies have analysed how mergers may affect institutional diversity within the higher education landscape. Focusing on institutional missions, the current study analyses the strategic plans of both merged and non-merged institutions in Norway. The key finding is that mergers may not necessarily reduce system level diversity, although mergers indeed may affect the organisational mission of individual institutions.