In literature it has been stated that in times of low capital barriers policies can impact real exchange rates (RERs) and, it has been shown that RERs influence foreign direct investment (FDI). As inward FDI is a growth stimulating factor for the German economy and as more than a third of inward FDI stems from countries in the European Union (EU), this study investigates the RER-FDI link between Germany and seven EU countries. The impact of bilateral RERs between Germany and seven EU countries on German net FDI inflows is examined for the period 1974-2018. Further, it is investigated how the euro introduction in 1999 affected the RER-FDI links. Using Ordinary Least Squares models it is found that in the pre-euro period a real German currency appreciation led to decreases in net FDI from most economies in scope. This negative RER-FDI link endures for the non-euro countries Sweden, Denmark, and the United Kingdom after the euro introduction. France, Italy, and Spain, euro countries, are subject to the euro-effect: the negative RER-FDI link changes to a positive link with the euro introduction. This phenomenon indicates an altering investment behavior. The results are strengthened by a panel estimation as robustness check. As the euro-effect was not discovered in previous studies nor is a theory established explaining the altering investment behavior of euro firms, this thesis suggests an alternative explanation.