Sergiusz Piasecki (Polish pronunciation: [ˈsɛrɡʲuʂ pjaˈsɛt͡skʲi]; 1901 in Lachowicze near Baranowicze – 1964 in Penley, London) was one of the best known Belarusian-Polish writers of the mid 20th century. He was mainly portraying life of criminals and lowlifes of Minsk, which he knew very well, as well as work of Polish spies in Soviet Union and later the anti-Nazi conspiracy in Wilno; he had personal experience in both matters.