Marshall Harvey Twitchell (February 29, 1840 – August 21, 1905) was a teacher, officer in the Union Army, and businessman. From Vermont, he became a prominent political figure in Louisiana's post-war Reconstruction, including two terms as a Republican member of the Louisiana State Senate. He was seriously wounded during the Civil War and was shot multiple times in an assassination attempt by white supremacists after the war. He returned north, served as a diplomat in Canada, and wrote a memoir.