John Work Garrett (May 19, 1872–June 26, 1942) was an American diplomat. His postings included Minister to Venezuela, Argentina, and the Netherlands, and Ambassador to Italy.
John Work Garrett, the grandson of Baltimore and Ohio Railroad President and banker John W. Garrett was born in Baltimore, Maryland on May 19, 1872. His uncle Robert Garrett also served as President of the B & O, and his father Thomas Harrison Garrett operated the family's bank in Baltimore.
The younger John W. Garrett graduated from Princeton University in 1895 and began a career at the bank owned by his family.
In 1901 Garrett embarked on a diplomatic career with appointment as Secretary of the United States legation at The Hague. In 1905 he transferred to a similar position in Berlin, and in 1908 another transfer brought him to Rome.
Garrett was appointed Minister to Venezuela in 1910 and served until 1911, when he was appointed as Minister to Argentina.
In 1914 Garrett left Argentina when he was appointed as a special assistant to the Ambassador to France. He served in this post until 1917. As an American diplomat in Europe during World War I, Garrett took part in commissions and conferences on the handling of prisoners of war and other war-related issues.
From 1917 to 1919 Garrett served as Minister to the Netherlands and Luxembourg.