Mark Leslie Hersey (December 1, 1863 – January 22, 1934) was a major general in the United States Army who commanded the 4th Division during World War I.

Among his classmates included several general officers of the future, such as Charles Gerhardt, Charles S. Farnsworth, Nathaniel Fish McClure, Michael Joseph Lenihan, Herman Hall, William Weigel, Ernest Hinds, Ulysses G. McAlexander, James Theodore Dean, Frank Herman Albright, Marcus Daniel Cronin, George Owen Squier, Thomas Grafton Hanson, George Washington Gatchell, Alexander Lucian Dade and Edmund Wittenmyer.

Hersey was promoted to colonel in May 1917, shortly after the American entry into World War I, which occurred the month before.

He commanded the 155th Infantry Brigade during the later stages of the Meuse–Argonne offensive and led it in a successful assault on German positions in the Bois des Loges near Tracy-le-Mont.

Hersey was promoted to major general (NA) in October and assumed command of the 4th Division in France on the last day of the same month—shortly before the Armistice which ended hostilities on November 11.

As a Brigade Commander during the latter part of the Meuse-Argonne operation, General Hersey exhibited qualities of excellent leadership and sound judgment.

Hersey reverted to his permanent rank of colonel in August 1919, graduated from the Army War College in 1920 and was promoted to brigadier general in July of the same year.

He received the Navy Cross for distinguished service while commanding the destroyer USS Sampson (DD-63) during the First World War.