Helena Mniszek (family name Mniszek-Tchorznicka, surname by first marriage: Chyzynska, 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 Tredowata written in 1909 brought her to prominence.