Shubnikov–de Haas effect (SdH) measurements and complementary electrical resistivity and specific heat measurements were performed on a high-quality whisker single crystal of UP 2 . All except one of detected branches exhibit angular dependences clearly indicating the Fermi surfaces (FS) of cylindrical form. The effective cyclotron masses were determined to range from 1.9 to 9.3 m 0 , which yields an electronic specific heat coefficient of 25 mJ/K 2 ·mol. This is in good agreement with 27 mJ/K 2 ·mol determined directly by the low-temperature specific-heat measurement. As in sister compounds UAs 2 , USb 2 and UBi 2 , the two-dimensional Fermi surfaces are formed in the flattened magnetic Brillouin zone and the conduction electrons are confined mainly in the U planes. Significant contribution of itinerant 5 f electrons to the conduction band is concluded from rather big effective cyclotron masses.