The thesis describes the concept of municipality institutional structure. Historical development of local government, problems and urgent issues of local government after Ruling of the Constitutional Court of the Republic of Lithuania of 24 December 2002 after which many substantial changes have taken place in the local government structure, one very significant of them being separation of representation and executive institutions and delimitation of their functions, are discussed in this thesis. A summary of changing of institutional structure of Lithuanian municipalities during 1990-2006 is provided, three principal models applied during that period are shortly described and analyzed. New provisions of Law on Local Self-Government and Law on Public Service are compared. Analyzed problems in local government are related with status of director of administration, mayor, member of municipality board, establishment of municipality institutions and enterprises, right of the public servants to work in another positions. Procedure of direct elections of mayor, internal organizational structure of municipalities and other legal aspects of organization of their activity are analyzed, and some problems of legal regulation of activity of these institutions are overviewed. As well the author of thesis submits proposals concerning principal institutional structure models of Lithuanian municipalities and local government election systems which could be chosen and applied in the future... [to full text]