Petras Geniušas (born 1961 in Vilnius) is a Lithuanian classical pianist.
In his career he has been working with Alfred Schnittke, Bronius Kutavičius, Osvaldas Balakauskas and Leonid Desyatnikov, composers who have dedicated several of their compositions to the pianist. Petras Geniushas' career as a teacher has included such engagements as Master Classes in Tokyo and Osaka, the Swedish-Baltic Master Classes Academia Baltica, and the Royal Academy of Music in London. The pianist has permanent teaching positions at the Lithuanian Academy of Music and Theatre, and the Yamaha Music Foundation Primary Music School in Tokyo. For his wide-range concert activities, Petras Geniušas has been honored with the Lithuanian National Prize.