This chapter examines the issue of business ethics. It first explains why business ethics matter. It then considers the notion of notion of corporate responsibility, and sets out policies and practices to ensure that businesses have an ethical dimension to their decision-making. The chapter explores the role of businesses in promoting worldwide social goods. It also considers the role of the lawyer in helping businesses to behave in an ethical way. This can be a particular challenge for in-house lawyers who may find a tension between their role as an employee of a firm and as a voice to ensure good practice.