Robert Milton Leach (April 2, 1879 – February 18, 1952) was a United States representative from Massachusetts.

He moved to Taunton, Massachusetts, in 1900 and engaged in the chain-store furniture business in New England.

He was commissioned as captain in the Ordnance Division of the United States Army during World War I.

He was elected as a Republican to the Sixty-eighth Congress to fill the vacancy caused by the death of William S. Greene and served from November 4, 1924, to March 3, 1925.

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