Justyna Bąk (born August 1, 1974) is a long-distance runner from Poland, who specializes mainly in the 3000 metres steeplechase.
She is a four-time national champion in the women's 5,000 metres, and a former world record holder in the 3,000 metres steeple.
She was born in Biłgoraj.
Bąk won the 2003 edition of the Cross Internacional de Venta de Baños.
This biographical article relating to Polish athletics is a stub.