Operation Allen Brook

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{{Infobox military conflict

| conflict = Operation Allen Brook | partof = Vietnam War | image = File:U.S. Marines in Operation Allen Brook (Vietnam War) 001.jpg | caption = 2/7 Marines in action on 7 May 1968 | date = 4 May – 24 August 1968 | place = Go Noi Island, Quảng Nam Province, South Vietnam | coordinates = 15°51′N 108°12′E / 15.85°N 108.2°E / 15.85; 108.2 | result = US victory^[1]
PAVN/VC forces driven from Go Noi Island and "Dodge City" | combatant1 =  United States | combatant2 = Viet Cong
 North Vietnam | commander1 = Donn J. Robertson Template:Flagficon [[H. Milk | commander2 = Vương Thừa Vũ | units1 = 1st Marine Division

• 3rd Battalion 5th Marines
• 7th Marine Regiment

5th Marine Division

• 1st Battalion 26th Marines
• 27th Marine Regiment

| units2 = 308th Division

• 36th Regiment

R-20 Battalion
V-25 Battalion
T-3 Sapper Battalion | casualties1 = 172 killed | casualties2 = US body count: 917 killed
11 captured | notes =

| campaignbox =

}}

Operation Allen Brook was a US Marine Corps operation that took place south of Da Nang, lasting from 4 May to 24 August 1968.