Daniel Zygmunt Welna (born 3 December 1955 in Bydgoszcz) is a Polish sprint canoer who competed in the late 1970s and early 1980s.
He won seven medals at the ICF Canoe Sprint World Championships with two golds (K-4 500 m and K-4 1000 m: both 1977), two silvers (K-2 500 m: 1981, K-4 1000 m: 1979), and three bronzes (K-2 1000 m: 1981, K-4 500 m: 1978, 1979).
Welna also competed in two Summer Olympics, earning his best finish of fourth in the K-4 1000 m event at Moscow in 1980.