Sidney Dara Blandford (June 12, 1868 – November 28, 1929) was a lawyer and political figure in Newfoundland.
He represented Bonavista in the Legislative Assembly of Newfoundland and Labrador from 1904 to 1913 as a Conservative and then as a member of the People's Party.
He served in the Executive Council as Minister of Agriculture and Mines.
Blandford was one of the founding owners of the Newfoundland Hotel in St. John's.
His uncle Darius Blandford also served in the Newfoundland assembly.