Irmgard Keun (February 6, 1905 – May 5, 1982) was a German author noteworthy both for her portrayals of life in the Weimar Republic as well as the early years of the Nazi Germany era.

Irmgard Keun was born in Berlin (Charlottenburg) to Eduard and Elsa Charlotte Keun on February 6, 1905. She and her family, including her brother Gerd, born in 1910, lived in the city until 1913, when they moved to Cologne. There Keun attended a Lutheran girls' school, from which she graduated in 1921. She worked as a stenotypist, but also attended acting school in Cologne from 1925-1927. Although she then landed stage roles in Greifswald and Hamburg, these were only somewhat successful, and she decided to abandon her acting career in 1929. Encouraged by German writer Alfred Döblin, she turned her hand to writing.

In 1932, she married the writer and director Johannes Tralow. They divorced in 1937.

Keun's first novel, Gilgi - One of Us, made her famous, as well as her next book and best-seller, The Artificial Silk Girl.