Plato Ernest Oliver Shaw (April 2, 1883 — August 5, 1947) was an American historian and seminary professor born inAthens, Greece. A graduate ofYale Divinity School,Columbia University,Union Theological Seminary, theUniversity of Edinburgh, andOxford University, he was professor atHartford Theological Seminary from 1924 to 1941. His major research focus was relations between Anglicans and Orthodox Christians. Shaw also wrote on theCatholic Apostolic Church.

He was a member of theAmerican Historical Association, theAmerican Library Association, theAmerican Society of Church History, theOxford Union, and a fellow of theRoyal Historical Society (1921). He renounced his status as a British subject to become an American citizen on March 4, 1929. Shaw was an ordained Methodist pastor. He married Elizabeth Rosemary Vincent in New York City on August 8, 1930.

Shaw died in New York, and is buried at Stout-Manners Cemetery inRingoes, New Jersey.

• Essay on the Patriarch Gennadios II. and the Greek Church at the Conquest (1919)
• The Early Tractarians and the Eastern Church (1930)
• American Contacts with the Eastern Churches, 1820-1870 (1937)
• The Catholic Apostolic Church, Sometimes Called Irvingite: A Historical Study (1946)
• The Iconoclastic Conflict: Its Causes and Significance (undated)

• "Dr. Plato E. Shaw Retired Professor Dies in New York,"Hartford Daily Courant, August 6, 1947, page 4.
• "Dr. Plato E. Shaw, A Theologian, 64; Retired Professor at Hartford Seminary Dies—Wrote Books on History of the Church,"The New York Times, August 6, 1947.

• Grave at Stout-Manners Cemetery

• 1883 births
• 1947 deaths
• 20th-century American historians
• 20th-century American male writers
• American male non-fiction writers
• Columbia University alumni
• Alumni of the University of Oxford
• Yale University alumni

• Articles with short description
• Short description matches Wikidata