Andrzej Mularczyk (born 13 June 1930 in Warsaw), is a Polish writer, screenwriter, reporter, and author of radio dramas.
His brother is the Polish writer Roman Bratny.
He made his literary debut in 1943 in the conspiratorial publication Dźwigary, which published his work (anonymously). After the war, in 1949 he began to work as a journalist at the same time as he was pursuing studies in the Journalism Department of the University of Warsaw. He completed his studies in 1955. He worked as a reporter and columnist for the weekly publication "Świat". He has been a member of the Związek Literatów Polskich since 1955 and of the Stowarzyszenie Filmowców Polskich since 1964.
In 1970-1977 he worked as literary director in the film group Iluzjon, and also worked for Polish Radio for many years.
Many films have been based on his screenplays, including some that are very widely known in Poland such as the series Sami swoi, Nie ma mocnych, Kochaj albo rzuć, and the television serial Dom. He has written a total of around 40 screenplays. He is the author of the film story Post mortem. Katyń, released in 2007, which served as the basis for Andrzej Wajda’s film Katyń about the Katyn massacre.
Under the pseudonym Andrzej Jurek he co-authored the screenplay for the film Liczę na wasze grzechy, together with Jerzy Janicki.