Marietta L. B. Stow (1830 or 1837–1902) was an American politician and women's rights activist. Throughout her career in law and politics, Stow advocated for women's suffrage, access to political office, and probate law reform.
Stow ran for Governor of California in 1882, as the Women's Independent Political Party candidate. She and Clara S. Foltz nominated Belva Ann Lockwood for President of the United States, and Stow ultimately supported Lockwood on the National Equal Rights Party ticket as its vice presidential candidate in the 1884 United States presidential election. Stow was the first woman to run for vice president of the United States. The Equal Rights Party platform included equal rights for men and women, a curtailment of the liquor traffic, uniform marriage and divorce laws for the entire nation, and "universal peace." The ticket won some 4,000 votes nationwide.
In 1892 she was a vice presidential candidate again, nominated by the "National Woman Suffragists' Nominating Convention" on September 21 at Willard's hotel in Boonville, New York presided over by Anna M. Parker, President of the convention. This time Victoria Woodhull was at the top of the ticket.
She was the editor of a publication, Women's Herald of Industry. She created a fad diet known as "cold trucks."