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James Markham Marshall (1764–1848), United States federal judge •
James Garth Marshall (1802–1873), English politician, MP for Leeds •
James Keith Marshall (1817–1862), American planter and politician in Virginia •
James S. Marshall (1819–1892), American politician, mayor of Green Bay, Wisconsin • Sir
James Marshall (judge) (1829–1889), British colonial judge •
James Marshall (politician) (1843–1912), member of the New Zealand Legislative Council •
James William Marshall (politician) (1844–1911), US congressman from Virginia •
James G. Marshall (politician) (c. 1852–1891), American politician in Mississippi •
James Alexander Marshall (1888–1977), Canadian federal politician •
James Marshall (political adviser) (born 1980), British political advisor ==Military==