Wieslaw Kielar (12 August 1919 – 1 June 1990) was a Polish author, filmmaker and prisoner in the concentration camp Auschwitz.
Kielar was arrested in the beginning of 1940 in Jaroslaw and was one of the first prisoners of concentration camp Auschwitz (identification number 290).
He spent almost five years in different parts of the complex.
He held various positions, including nurse, writer and "prison senior".
After the Second World War he went to the National Film School in Lódz and worked as a filmmaker.
About his stay in Auschwitz he wrote the book Anus Mundi: 1,500 Days in Auschwitz/Birkenau.