The article examines the definition of «integrity» as a legal category in Ukraine. The problems of origin and development of this category in Ukraine in the normative and doctrinal plane are analyzed. The legal problems that arise when defining integrity as a legal category are outlined.It is noted that for the first time in the national legislation the notion of «integrity» was used in the Concept of administrative reform in Ukraine dated 22.07.1998 to denote the principle of activity of executive bodies according to which it is necessary to carry out reforming of their activity. However, the legislator did not specify the essence of this principle. 
 In national legislation, the notion of «integrity» again was used in 2006, with the adoption of the Concept of Overcoming corruption in Ukraine «On the Road to Integrity» from 11.09.2006.Legal negligence called for the mass reliability of the court calls from the state services, judges, prosecutors about the recognition by the counterparts that the decision about the failure of them to pass the attestation of the quality of the “critical evaluation”At the present stage, the category of integrity has entered the legal field of Ukraine. Despite the fact that national legislation does not contain a definition of such a concept, it is actively used in many regulations.The ambiguity of the translation of the English term «integrity», the lack of a strong position of the legislator, who used the term «integrity» both to define the principles of reforming public authorities and local government, as well as to formulate requirements for moral qualities of psychological personality of persons performing state or local government and judicial functions, and also as the antithesis of corruption. The complexity, ambiguity and diversity of «integrity» as a philosophical and ethical category have led to the emergence of an uncertain and ambiguous notion in the national legal sphere, the interpretation of which depends on the ideas and perceptions of the person interpreting it. As a result, it acquired signs of subjectivity, which negatively affects the social relations in the settlement of which it is applied.