The class delivers an introduction to the modern research field "Behavioral Finance". Behavioral Finance aims to explain and predict financial decision making and financial market data by incorporating behavioral insights on individual judgment and decision making. First, systematic errors in individual decision making will be presented and frequently used heuristics will be considered. Afterwards, the consequences of the biases and heuristics will be discussed in a financial context and supported by empirical and experimental research findings. Finally, the implications for financial markets will be explored and the relevance of behavioral findings in the context of the market efficiency hypothesis and arbitrage considerations will be discussed. The lecture will be supported by a tutorial and taught in English.