The course deals with the problem of soil contamination, which is a crucial environmental problem worldwide. The topics which are covered include presentation of the main categories of pollutants and analysis of their fate and transport in the environment. A risk assessment methodology, as decision making tool for evaluating the risks associated with contaminated sites and for setting remediation priorities, is also presented. The most important remediation technologies for the case of organic contaminants, based on physical and biological processes, are analyzed in detail.