John Gallagher Montgomery (June 27, 1805 – April 24, 1857) was a lawyer who representedPennsylvania in theU.S. Congress briefly in 1857.

Montgomery was born inNorthumberland, Pennsylvania on June 27, 1805. After studying under a private tutor, he graduated from Washington College (nowWashington and Jefferson College) inWashington, Pennsylvania, in 1824. He then studied law, was admitted to the bar in 1827 and commenced practice in Danville.

He was a member of thePennsylvania House of Representatives in 1855.

Montgomery was elected as a Democrat to theThirty-fifth Congress and served until his death. He attended the inauguration dinner forPresident Buchanan at theNational Hotel where he was reported to have been deliberately poisoned, along with many other attendees. This incident is now known asNational Hotel Disease, and is believed to have been caused byfood poisoning related to poor sanitation.

Montgomery returned home ill, and died at Danville five weeks later. He was interred at the Episcopal Cemetery in Danville. ACenotaph was erected in his honor at theCongressional Cemetery in Washington, D.C.

• List of members of the United States Congress who died in office (1790–1899)
• List of members of the United States Congress killed or wounded in office

• United States Congress."John Gallagher Montgomery (id: M000868)".Biographical Directory of the United States Congress.
• The Political Graveyard

• 1805 births
• 1857 deaths
• 19th-century American lawyers
• Burials at the Congressional Cemetery
• Democratic Party members of the United States House of Representatives from Pennsylvania
• Democratic Party members of the Pennsylvania House of Representatives
• Pennsylvania lawyers
• People from Danville, Pennsylvania
• People from Northumberland, Pennsylvania
• Washington & Jefferson College alumni
• Deaths from dysentery
• 19th-century members of the Pennsylvania General Assembly
• 19th-century United States representatives

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