Kazimiera Zawistowska de domo Jasieńska, pseudonym Ira, (1870–1902) was a Polish poet and translator.
Zawistowska was an author of modernist erotic and landscape poems related with mysticism, symbolism and Parnassianism. She published her works in Kraków and Warsaw magazines – Życie, Krytyka and Chimera. Zawistowska translated poems of Belgian and French symbolists, including Charles Baudelaire, Paul Verlaine, Albert Samain.
Kazimiera Zawistowska was born in 1870 in Rasztowce, Podolia. After education, she moved to Switzerland and Italy. After back to Poland, she married with Stanisław Jastrzębiec-Zawistowski and lived with him in Supranówka in Podolia.
She died on 28 February 1902 in Kraków. The cause of death was probably suicide.