George Patten "Pat" Reiffenstein (later Carr, March 23, 1883 – June 9, 1932) was a Canadian rower who competed in the 1904 Summer Olympics.

In 1904 he was a member of Canadian boat, which won the silver medal in the men's eight.

He changed his last name to Carr following World War I and died in Whitby, Ontario in 1932.

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