Marietta L. B. Stow (1830–1902) was an American suffragist. She ran for Governor of California as the candidate of the Women's Independent Political Party. She and Clara S. Foltz nominated Belva Ann Lockwood for President of the United States, and Stow ended up supporting her on the ticket of the National Equal Rights Party as their Vice Presidential candidate in the United States presidential election, 1884. In 1892 she was again a vice-presidential candidate, 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."
Her husband Joseph W. Stow died in 1872.