Douglas "Duggy" Clark MM (2 May 1891 – 1 February 1951) was an English rugby league footballer, wrestler and World War I veteran.

A Rugby Football League Hall of Fame inductee, he played for Huddersfield, Cumberland, England and the Great Britain national side, as a forward.

[5] During the 1909–10 Northern Rugby Football Union season, Clark's first, he played in Huddersfield's 21–0 victory over Batley in the 1909 Yorkshire Cup Final at Headingley, Leeds on Saturday 27 November 1909.

Clark played in Huddersfield's 19–3 victory over Bradford Northern in the 1913 Yorkshire Cup Final at Thrum Hall, Halifax on Saturday 29 November 1913.

Going on the 1914 Great Britain Lions tour of Australia and New Zealand, he played for in the famous "Rorke's Drift Test" in Sydney when his side won with 11 men.

Clark played in the 37–3 victory over St. Helens in the 1915 Challenge Cup Final at Watersheddings, Oldham on Saturday 1 May 1915 in front of a crowd of 8,000.