This text is a course on Swiss Law and in particular Commercial Law and Contract Law. On the whole it adopts a traditional way to present the various topics, a manner that is close to the way the law itself has been classified in the various codes and other provisions. Where possible, a synthetic and comparative manner is adopted so as to group various legal issues together or highlight differences. Informed comments and advice are given where necessary so as to alert the reader of the important issues. The educational purpose of this text is expressed in the interaction between law and case law all along the nine chapters. Favoring research and critical reflection, this course is suitable for both undergrads and graduates who are new to Swiss Law and wish to discover two specific and vital areas for businesses via an approach that is constantly informed by legal practice.