This thesis analyzes the impact of the Atlantic Multidecadal Oscillation (AMO) on North European climate and traces the AMO signal into the Baltic Sea region. With a frequency of 50 - 90 years, effects of the AMO are difficult to evaluate, since observations are limited to about 150 years. To overcome this lack of observational data, a combination of a general circulation model (GCM) and a regional climate model (RCM) is used to analyze the preindustrial period from 950 - 1800. In summary, this work shows that the AMO plays an important role for the climate of the Baltic Sea.