This study aims to comprehensively investigate the functions and principles of supervision and control over labor legislation compliance within the context of labor law. Based on the analysis of scientific views of scholars, the article offers the author's own definition of the concept of "functions" in the context of supervision and control over compliance with labor legislation. The following functions of supervision and control are distinguished: law enforcement; regulatory; informational; educational and managerial. Theoretical approaches to the interpretation of the concept of principle from a legal point of view are generalized. Two groups of principles of supervision and control over compliance with labor legislation are distinguished: general and special. A meaningful description of each group of principles is given.