Donald Paterson Turnbull (28 May 1909 – 30 January 1994) was a professional tennis player from Australia.

He won the men's doubles title at the Australian Championships twice, in 1936 and 1937.

[2] Turnbull represented Australia in three Davis Cup ties, including the 1933 Europe Zone final against Great Britain.

[3] Turnbull beat defending champion Edgar Moon at the 1931 Australian Championships.

[4] Turnbull lost in the semifinals to Jack Crawford in straight sets.