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, , 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 practised corporate and tax law. From 1957 to 1961, he was a councillor in Forest Hill, Ontario. He served as federal campaign chairman in 1962 and 1963 for the Liberal Party.