Mary R. P. Hatch (née, Platt; pen name Mabel Percy; June 19, 1848 – November 28, 1935) was an American author from New Hampshire.

She contributed stories to the Transcript, Mountaineer, Fireside Companion, Chicago Ledger, Frank Leslie's Illustrated Newspaper, Springfield Republican, Granite Monthly, The Writer, and several magazines including the Portland Transcript, The Saturday Evening Post, Peterson's Magazine, as well as other periodicals.

She attended the common district school until about 15 years of age, and at that time entered into advanced classes at the Lancaster academy, where she took high rank in mathematics, French, and rhetoric.

[4] Hatch's versatility afforded her to work in various areas of literature; for instance, at the same time that she was engaged in writing The Bank Tragedy, a biographical sketch for The Writer, she also wrote a series of dialect papers.

She contributed stories for the Transcript, Mountaineer, Fireside Companion, Chicago Ledger, Frank Leslie's Illustrated Newspaper, Springfield Republican, Granite Monthly, The Writer, and several magazines.