The immunophenotyping of the lymphoproliferative diseases is considered to be an integral part of the diagnostic process pointing to the correct classification of the individual diseases and to the choice of the most suitable type of therapy. This article describes the immunophenotype of particular types of B-lymphoproliferative disorders included in the World Health Organization classification (WHO) and the prognostic importance of some markers. The panel of specific monoclonal antibodies directed to B-cell lineage used in our department is displayed.