Marshall Davis Ewell (August 18, 1844 – 1928) was an American lawyer.

Ewell was born at Oxford, Michigan in 1844. He graduated from the University of Michigan Law School in 1868. He founded Kent College of Law, which merged with Chicago College of Law in 1887 to become Chicago-Kent College of Law. In 1969, Chicago-Kent became part of Illinois Institute of Technology.

Ewell wrote numerous publications and he edited Blackwell on Tax Titles, Evans on Agency, and Lindley on Partnership. He was the author of:

• Leading Cases on Disabilities (1876)
• Treatise on the Law of Fixtures (1876; second edition, 1905)
• Essentials of the Law (1882)
• Manual of Medical jurisprudence (1887; second edition, 1909)
• Essentials of Commercial Law, with Whigam and Skinner (1913)

• The Iron Man (1924 film)
• The Iron Man: A Musical
• The Iron Man & Other Tales of the Ring
• The Iron Man (serial)
• The Ironmaster
• The Iron Men
• The iron monger
• The Iron Ring (novel)
• The Iron Rose
• The Iron Saints
• The Iron Shroud
• The Iron Stair
• The Iron Stair (1920 film)
• The Iron Stair (1933 film)
• The Iron Star
• The Iron Stone
• The iron sword of Inariyama Kofun
• The Iron Terror
• The Ironton Tribune
• The Iron Tree
• The Iron Woman (novel)
• The Irony of Fate 2
• The Irrawaddy Delta
• The Irrefutable Truth about Demons
• The Irrefutable Truth About Demons