This is an incomplete list of military and other armed confrontations that have occurred within the boundaries of the modern US State of Oklahoma since European contact. The region was part of the Viceroyalty of New Spain from 1535 to 1679, New France from 1679 to 1803, and part of the United States of America 1803–present.
|Battle of the Twin Villages||1759||uncertain||114||Kingdom of New Spain vs Wichita|
|Battle of Claremore Mound||October 1817||modern Rogers County||38+||Cherokee vs Osage|
|Cutthroat Gap Massacre||Spring of 1833||modern Kiowa County||150||Osage vs Kiowa|
|Battle of Wolf Creek||June 1838||modern Ellis County||72||Cheyenne & Arapaho vs Kiowa, Comanche, & Apache|
|Battle of Little Robe Creek||May 12, 1858||modern Ellis County||Plains Indian Wars||Antelope Hills Expedition||78||Comanche vs Texas Rangers|
|Battle of the Wichita Village||October 1, 1858||near modern Rush Springs||Plains Indian Wars||Wichita Expedition||75||Comanche vs 2nd U.S. Cavalry|
|Battle of Round Mountain||November 19, 1861||unknown / location disputed||American Civil War||Trail of Blood on Ice||6+||Creek & Seminole vs Confederate States of America|
|Battle of Chusto-Talasah||December 9, 1861||near modern Tulsa||American Civil War||Trail of Blood on Ice||15+||Creek & Seminole vs Confederate States of America|
|Battle of Chustenahlah||December 26, 1861||near modern Skiatook||American Civil War||Trail of Blood on Ice||9+||Creek & Seminole vs Confederate States of America|
|Battle of Old Fort Wayne||October 22, 1862||Fort Wayne||American Civil War||Operations North of Boston Mountains (1862)||64+||United States of America vs Confederate States of America|
|Tonkawa Massacre||October 24, 1862||modern Caddo County||American Civil War||137-150||Osage vs Tonkawa|
|Battle of Cabin Creek||July 1-2, 1863||modern Mayes County||American Civil War||Operations to Control Indian Territory (1863)||88||United States of America vs Confederate States of America|
|Battle of Honey Springs||July 17, 1863||modern Muskogee County & McIntosh County||American Civil War||Operations to Control Indian Territory (1863)||167||United States of America vs Confederate States of America|
|Battle of Middle Boggy Depot||February 13, 1864||near modern Allen||American Civil War||Operations to Control Indian Territory (1864)||47||United States of America vs Confederate States of America|
|Ambush of the steamboat J. R. Williams||June 15, 1864||near modern Tamaha||American Civil War||Operations to Control Indian Territory (1864)||4||United States of America vs. Confederate States of America|
|Battle of Washita River||November 27, 1868||near modern Cheyenne||Plains Indian Wars||Comanche Campaign||171+||United States of America vs Cheyenne|
|Battle of Soldier Spring||December 25, 1868||modern Greer County & modern Kiowa County||Plains Indian Wars||Canadian River Expedition||26||Comanche & Kiowa vs 6th U.S. Cavalry & 37th U.S. Infantry|
|Goingsnake Massacre||April 15, 1872||modern Adair County||11||U.S. Marshals vs. Cherokee|
|Sand Hill Fight||April 6, 1875||modern Canadian County||Plains Indian Wars||Red River War||Cheyenne vs U.S. Cavalry|
|Enid-Pond Creek Railroad War||1893-1894||modern Grant and Garfield Counties||Railroad Wars||0||Citizens vs. Rock Island Railroad|
|Crazy Snake Rebellion||March 1909||Okmulgee County||3||Creek Indians Snake Government vs. Local Citizens, 8th Cavalry Regiment U.S. Army, 1st Regiment Oklahoma National Guard.|
|Green Corn Rebellion||August 2-3, 1917||Pontotoc County||World War I||3||Tenant farmers vs. Local authorities|
|Tulsa Race Massacre||May 31 – June 1, 1921||Tulsa County||39||White citizens vs. Black citizens|
|Red River Bridge War||July 3 - September 7, 1931||Bryan County, Oklahoma and Grayson County, Texas||0||Oklahoma Army National Guard vs. Texas Ranger Division|
- Modern and historical sources are unclear whether the battle occurred in modern Montague County, Texas or modern Jefferson County, Oklahoma, although the former is the most likely. Archaeological surveys of the village on the Oklahoma side of the Red River have not produced any conclusive evidence of the battle's location there.
- Also known as Battle of the Strawberry Moon and Claremore Mound Massacre.
- Also known as the Battle of Cutthroat Gap.
- Also known as the Wolf Creek Massacre.
- Also known as the Battle of Antelope Hills.
- "CWSAC Battle Summary: Round Mountain". National Park Service. Retrieved 2013-01-03.
- One location is cited as being near modern Keystone, yet another location given is near modern Yale.
- No accurate count of Native American casualties survives. Opothleyahola, commander of the Native American force, estimated his losses as 110 killed and wounded.
- "CWSAC Battle Summary: Chusto-Talasah". National Park Service. Retrieved 2013-01-03.
- No accurate count of Native American casualties survives. Confederate Col Douglas H. Cooper estimated the Native Americans' losses at 500 killed and wounded, although some accounts are as low as 412.
- "CWSAC Battle Summary: Chustenahlah". National Park Service. Retrieved 2013-01-03.
- No accurate count of Native American casualties survives. Confederate Col James M. McIntosh estimated the Native Americans' losses at 250 killed and wounded.
- "CWSAC Battle Summary: Old Fort Wayne". National Park Service. Retrieved 2013-01-04.
- An Oklahoma State Historical site marker is placed on U.S. Hwy 59 north of Watts. However, the exact location of Fort Wayne has not been determined.
- "CWSAC Battle Summary: Cabin Creek". National Park Service. Retrieved 2013-01-03.
- "CWSAC Battle Summary: Honey Springs". National Park Service. Retrieved 2013-01-04.
- "CWSAC Battle Summary: Middle Boggy Depot". National Park Service. Retrieved 2013-01-04.
- The exact location on the river is known as Pleasant Bluff.
- Hoig, Stan. The Battle of the Washita: The Sheridan-Custer Indian Campaign of 1867-69 (Lincoln, NE: University of Nebraska Press), 1979.
- Rea, Bob. "Sand Hill Fight." Encyclopedia of Oklahoma History & Culture. Accessed June 13, 2020.
- "Archived copy". Archived from the original on 2010-10-15. Retrieved 2014-01-26.CS1 maint: archived copy as title (link)