Katarzyna "Kasia" Kowalska (born June 13, 1973 in Sulejówek, Poland) is a Polish pop rock singer, songwriter, producer, and actress.

Her musical experience began in the 1980s when she sang as a female vocalist for numerous Polish bands, including Human, Fatum and Talking Pictures. In 1994, she started solo career releasing album Gemini. The album is said to represent her complex personality with the name following her zodiac sign.