Partnership of public and private sectors (hereinafter - PPP) has been becoming the object of scientific research more and more frequently in Lithuania and Poland. lt is analyzed with regard to various approaches. Similarly to other countries, the demand for investments to improve quality of public services and their development is growing. However, public sector has limited possibilities to allocate sufficient financing for this purpose; therefore new means and possibilities are searched for to achieve these goals. In the authors' opinion, the PPP implementation is stili innovation in Lithuania and Poland, although more and more projects have been implemented in the institutions of public sector in cooperation with public sector in attempt to regulate legally the area of contractual relations between the public and private sectors. The article has analyzed theoretical aspects of PPP and presented description of different roles of various interest groups in the PPP process. With regard to the data of theoretical analysis and empirie data, the PPP forms were named and justified, and the practical possibilities of application of the aforementioned forms were suggested.