Clifford Douglas "Cliff" Blankenship (April 10, 1880 in Columbus, Georgia – April 26, 1956 in Oakland, California) was a professional baseball player.
He played his first game on April 17, 1905.
He played his 95th and final game on August 18, 1909.
His batting average was .225.
In 1907, Senators manager Joe Cantillon sent Blankenship to Weiser, Idaho, to scout pitcher Walter Johnson.
Blankenship successfully persuaded Johnson to accept a Washington contract.