The basic aim of the study is to describe the ambiguity of the term legal ethics in the context of different traditions and conceptions. The three most important traditions of legal ethics are: the French, with the categories of virtue and independence, the American, with the ideas of loyalty and professional duties, and the German, with professional roles and obedience. On that base, a theory of critical legal ethics is developed. It claims that the subject of legal ethics consists of three planes – deontological, social and moral. Further it is examined, whether chosen legal-philosophical conceptions contain any legal ethics conceptions and what could be the interdisciplinary research program of legal ethics.