Daniel Aiken Lang (June 13, 1919 – December 1, 1997) was a Canadian senator.
Born in Toronto, Ontario, the son of Daniel Webster Lang who co-founded the law firm of Lang Michener, Lang attended Upper Canada College, Trinity College, University of Toronto, and Osgoode Hall Law School.
During World War II, he served as a lieutenant in the Royal Canadian Naval Volunteer Reserve.
After the war, he joined his father's law firm and was called to the Bar of Ontario in 1947.
He was summoned to the Senate of Canada for the Ontario senatorial division of South York on the advice of Prime Minister Lester B. Pearson in 1964.