The number of multinational corporations (MNCs) has increased tremendously since the 1990s, as companies have started to act in a more global environment. This has resulted in more integration between economies, where companies have to adjust to this changing environment. In this paper, we study the impact of internationalization on nationality diversity in boards of Swedish MNCs during the period 1994-2012. Our propositions suggest that board size, a company’s degree of internationalization and country of origin are contributing factors that affect how a board is composed. Our findings concluded that companies with a high degree of internationalization often are more nationality diverse and that Swedish companies have gradually increased the number of non-Swedes in their boards over time.