Grzegorz Koltan (born September 15, 1955) is a Polish sprint canoer who competed from the mid to late 1970s.
He won six medals at the ICF Canoe Sprint World Championships with two golds (K-4 500 m: 1977, K-4 1000 m: 1977), a silver (K-4 1000 m: 1979), and three bronzes (K-4 500 m: 1978; K-4 10000 m: 1974).
Koltan also competed in two Summer Olympics, earning his best finish of fourth in the K-4 1000 m event at Moscow in 1980.