Over the years the research regarding the versatility and variety of roles that oxytocin takes on in social behavior has grown substantially. The focus has mainly been on the reproductive functions of the hormone since it is released in the body during and after childbirth to help the mother connect with her offspring. More recent research shows that oxytocin influences higher-level social cognitive behaviors such as empathy, recognition, and trust. A connection between oxytocin and trust has been suggested, but not yet established. This thesis will further investigate if human trusting behavior is correlated with levels of oxytocin, and if so, to what degree. It seems that to what extent oxytocin affects human trust is due to personal and situational characteristics. By understanding how oxytocin can influence human trusting behavior researchers will get a better insight to persons suffering from conditions affecting their social abilities, such as anxiety, autism and schizophrenia. The study of oxytocin faces some problems, which will be brought up in this thesis. Among them is the unclear correlation between central and peripheral oxytocin levels. Another problem is how oxytocin interacts with other hormones in the body, and if the correlation with trusting behavior is due to hormones’ combined effects. More research in the field is needed to investigate how more complex human behaviors such as trust, can be modulated with the help of oxytocin. Further studies with broader and larger populations need to be conducted before any conclusion can be drawn.