This paper presents the issue of a lawyer’s integrity from the perspective of the assumptions underlying the original concept of a holistic approach to law and legal practice. In the course of the discussion, the basic principles of legal holism, the assumed understanding of lawyer’s integrity and their personal qualities forming the lawyer personality, and the problem of integrity in the context of the formula (model) shaping the lawyer-client relationship will be introduced. Legal holism recognises a lawyer’s self-knowledge, their conscious choice of professional role(s), the ways in which they are performed and the formula for working with clients and parties to disputes as crucial issues for the practice of law. It emphasises their complexity and possible impact on the postulated observance by a lawyer of the integrity of attitudes and actions in professional and private life. The author represents a research approach related to the concept of ontological and methodological multidimensionality of legal phenomena and the postulate of the so-called external integration of jurisprudence with the achievements of other sciences, including branches other than social (e.g. psychology or sociology).