Justyna Banasiak (born 2 May 1986 in Szczecin) is a Polish group rhythmic gymnast. She represents her nation at international competitions.
She participated at the 2004 Summer Olympics in the group all-around event together with Alexandra Wójcik, Martyna Dàbkowska, Maà Âgorzata à Âawrynowicz, Anna Mrozià Âska and Aleksandra Zawistowska finishing 10th. She competed at world championships, including at the 2005 World Rhythmic Gymnastics Championships.