Marcus Aurelius Root (1808–1888) was a writing teacher and photographer. He was born in Granville, Ohio and died in Philadelphia, Pennsylvania.
On 20 June 1846, he bought John Jabez Edwin Mayall’s Chestnut Street photography studio that was in the same building as Root’s residence in Philadelphia, Pennsylvania. Root had success as a daguerreotypist working with his brother, Samuel Root. The Root Brothers had a gallery in New York City from 1849 to 1857.