Marcus Daniel Cronin (9 January 1865 – 12 August 1936) was a United States military officer. He served in a number of conflicts, including the Spanish–American War, Philippine–American War and World War I.

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Marcus Daniel Cronin
From 1920's Holy Cross College Service Record, War of 1917
Born	(1865-01-09)9 January 1865 Worcester, Massachusetts
Died	12 August 1936(1936-08-12) (aged 71) Governors Island, New York
Buried	San Francisco National Cemetery
Allegiance	United States of America
Service/branch	United States Army
Years of service	1887–1926
Rank	Brigadier General
Service number	0-196
Battles/wars	Spanish–American War Philippine–American War World War I

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Cronin was born in Worcester, Massachusetts on 9 January 1865. He attended College of the Holy Cross, then began attendance at the United States Military Academy, from which he graduated in 1887; his classmates included future Major General George O. Squier, and his attendance was concurrent with that of future generals John Pershing and Peyton March. Later, Cronin attended the Army War College and graduated in 1911.^[1][2]

On 12 January 1887, Cronin was commissioned as a second lieutenant of the infantry and served on the United States frontier from 1887 to 1893. After his frontier duty, Cronin became an instructor at West Point from 1893 to 1897. With the outbreak of the Spanish–American War, Cronin became regimental adjutant of the 25th Infantry and served in the Santiago Campaign of 1898; during his time in Cuba, Cronin was also a member of the Sanitary Corps. In the subsequent Philippine–American War, Cronin served as colonel of the United States Volunteers and later became assistant chief of the Philippine Constabulary from 1915 to 1917. Following the United States' entry into World War I, Cronin was promoted to brigadier general of the National Army on 5 August 1917. He became commander of the 163rd Infantry Brigade at Camp Gordon, serving in France as part of the American Expeditionary Force. Cronin later retired in 1925.^[1][2]

Cronin married Helen Hannay on 2 August 1893. He lived in La Jolla, California, and later died in Governors Island, New York, on 12 August 1936.^[1][2][3] He was buried at San Francisco National Cemetery.