The main aim of the study was to diagnose interpersonal skills of professionally active school counselors. The research was diagnostic and descriptive. Interpersonal Competence Questionnaire (ICQ-R), compiled by Waldemar Klinkosz, Justyna Iskra and Magdalena Dawidowicz, was used to collect the research material. A diagnosis of five dimensions of interpersonal competences of counselors, necessary for effective functioning in interpersonal relations was made. They were: initiating relationships, assertive interactions, self-disclosure, and emotional support. The analysis of research results indicates that the surveyed counselors are people who are able to initiate relationships, meet people and conduct conversations with them. In relations with others, they are focused on providing emotional support and self-disclosure; they are able to express their opinions and positions. They deal well with the problems and conflicts that they have to solve in the educational environment. They can emphasize their position on important matters, and enforce their rights and clearly express expectations. Their interpersonal skills predispose them to perform the tasks of a school counselor.