This is the first comprehensive guide and only substantial undergraduate level introduction to ancient Greek and Roman ethics. It covers the ethical theories and positions of all the major philosophers (including Socrates, Plato and Aristotle) and schools (Stoics and Epicureans) from the earliest times to the Hellenistic philosophers, analyzing their main arguments and assessing their legacy. This book maps the foundations of this key area, which is crucial knowledge across the disciplines and essential for a wide range of readers.