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.
After back to Poland, she married with Stanisław Jastrzębiec-Zawistowski and lived with him in Supranówka in Podolia.