The aim of the article is to elaborate on the principles of the online edition of The Normative Dictionary of the Polish Place Names from the area of Lithuania. This is a normative dictionary. It contains Polish equivalents of contemporary Lithuanian place names from the area of Lithuania, their declination, adjectives and names of residents. The dictionary contains names of districts, towns and villages, counting over 20 residents from Vilnius, Šalčininkai, Trakai, Švenčionys and Širvintos regions. The dictionary includes names from the Vilnius area inhabited by numerous Polish minority, and selected names from different parts of Lithuania, important in terms of history, culture and society (e.g. from the area of Lauda and the vicinity of Kaunas). The article outlines the structure of the dictionary, looks into difficulties encountered in its development and supplements this study with a brief description of the Dictionary and of the present state of work on it.