Katarzyna Anna "Kasia" Smutniak (Polish pronunciation: ; born 13 August 1979) is a Polish-Italian actress and model.

Personal life
Smutniak was born in Piła, Poland. Her father, Brigadier General Zenon Smutniak, is a military pilot and served in the Polish Air Force. At 16, she obtained a glider pilot's license. Her mother was a nurse.

She has a daughter, Sophie, born in 2004 with Italian actor Pietro Taricone who died in an accident in 2010. She has a son, Leone, born in 2014 with Italian film producer Domenico Procacci. The couple later married in September 2019.

In addition to Polish, Smutniak is fluent in Russian, English and Italian.