Tadeusz Dołęga-Mostowicz (pronounced [taˈdɛ.uʐ dɔˈwɛŋɡa mɔˈstɔvit͡ʂ]; 10 August 1898 – 20 September 1939) was a Polish writer, journalist and author of over a dozen popular novels.

[2] Tadeusz Mostowicz, the son of a wealthy Polish lawyer in the age of partitions, was born on 10 August 1898 at his family's village of Okuniewo near Vitebsk in the Russian Empire (now Belarus).

After graduating from gimnazjum (high school) in Vilna (now Vilnius, Lithuania), then also in the Russian Empire, in 1915 Tadeusz embarked upon law studies at the University of Kyiv while the First World War raged on in Central Europe.

[1] After the Russian Revolution, Okuniewo was seized by Bolshevik Russia, and Mostowicz's family moved back to newly reborn Poland, where they bought a small village.

While working at printing houses, Mostowicz sent short stories to newspapers and was finally discovered to be a talented reporter.