Kazimiera Niewiarowska was born in 1890 in Warsaw, Poland, Russian Empire [now Warsaw, Mazowieckie, Poland]. She was an actress, known for Ach, te spodnie! (1914) and Kiedy kobieta zdradza meza (1924). She died on July 1, 1927 in Wilno, Wilenskie, Poland [now Vilnius, Lithuania].