Arthur Sewall (November 25, 1835-September 5, 1900) was an American Democratic politician and shipbuilder from Maine who served as one of William Jennings Bryan's first running mates in 1896 along with Thomas E.
Watson on the Populist Party ballot line.
From 1888 to 1896 he served as a member of the Democratic National Committee and unsuccessful ran for Maine's Senate seat against Eugene Hale.
The only elective offices Sewall held were as councilman and alderman in the town of Bath, Maine.