Scapa Flow (1924–1928) was an American Thoroughbred race horse, a son of Man o' War.

In August 1926, Morton Schwartz offered $100,000 to purchase Scapa Flow, but his owners refused to sell him at any price.

[2] With Frank Coltiletti as his jockey, Scapa Flow won the U.S. Hotel Stakes in Saratoga Springs, New York, in 1:14 2/5.

[1] On April 16, 1928, Scapa Flow lost the Harford Handicap by half a length at Havre de Grace, Maryland.

On a rain-soaked track, Scapa Flow, at 3-to-1 odds, was bested for second place by four lengths by Chance Shot, a 13-to-5 entry, owned by W. Averell Harriman.