Helena Mniszek (family name Mniszek-Tchorznicka, surname by first marriage: Chyżyńska, surname by second marriage: Rawicz Radomyska; 24 May 1878 – 18 March 1943) was a Polish novelist. She was born in Volhynia and died in Sabnie. Her debut novel The Leper written in 1909 brought her to prominence. Three of her novels were adapted into movies. "The Leper" was dramatised 4 times (3 films and one TV series).

Filmography