Contents page for 1ST BA
- 1st Baghdad Championship
- 1st Bagmati Provincial Assembly
- 1st Baltic Front
- 1st Banffshire Artillery Volunteers
- 1st Bangladesh National Film Awards
- 1st Bangor Old Boys F.C.
- 1st Bangsamoro Transition Authority Parliament
- 1st Banino
- 1st Baron Redesdale
- 1st Bassman
- 1st Battalion (Australia)
- 1st Battalion (Ontario Regiment), CEF
- 1st Battalion International Legion (Ukraine)
- 1st Battalion New York Volunteer Sharpshooters
- 1st Battalion of Somali Tirailleurs
- 1st Battalion Royal Irish Rifles in World War I
- 1st Battalion Tennessee Light Artillery, Battery "A"
- 1st Battalion Tennessee Light Artillery, Battery "B"
- 1st Battalion Tennessee Light Artillery, Battery "C"
- 1st Battalion Tennessee Light Artillery, Battery "D"
- 1st Battalion Tennessee Light Artillery, Battery "E"
- 1st Battalion Tennessee Light Artillery, Battery "F"
- 1st Battalion Tennessee Light Artillery, Battery "G"
- 1st Battalion Tennessee Light Artillery, Battery "K"
- 1st Battalion, 107th Cavalry Regiment
- 1st Battalion, 10th Marines
- 1st Battalion, 11th Marines
- 1st Battalion, 120th Field Artillery Regiment
- 1st Battalion, 12th Marines
- 1st Battalion, 14th Marines
- 1st Battalion, 153rd Infantry Regiment (United States)
- 1st Battalion, 161st Field Artillery Regiment (United States)
- 1st Battalion, 168th Field Artillery (Nebraska Army National Guard)
- 1st Battalion, 194th Field Artillery Regiment
- 1st Battalion, 1st Air Defense Artillery Regiment (United States)
- 1st Battalion, 1st Infantry Regiment
- 1st Battalion, 1st Marines
- 1st Battalion, 21st Field Artillery Regiment (United States)
- 1st Battalion, 227th Aviation Regiment (United States)
- 1st Battalion, 23d Marines
- 1st Battalion, 24th Marines
- 1st Battalion, 25th Marines
- 1st Battalion, 26th Marines
- 1st Battalion, 28th Infantry Regiment
- 1st Battalion, 28th Marines
- 1st Battalion, 2nd Marines
- 1st Battalion, 30th Field Artillery Regiment (United States)
- 1st Battalion, 319th Field Artillery Regiment
- 1st Battalion, 320th Field Artillery Regiment
- 1st Battalion, 321st Field Artillery Regiment
- 1st Battalion, 36th Infantry Regiment (United States)
- 1st Battalion, 377th Field Artillery Regiment
- 1st Battalion, 3rd Marines
- 1st Battalion, 4th Marines
- 1st Battalion, 503rd Infantry Regiment
- 1st Battalion, 5th Marines
- 1st Battalion, 68th Armor Regiment
- 1st Battalion, 6th Marines
- 1st Battalion, 76th Field Artillery Regiment
- 1st Battalion, 79th Field Artillery Regiment (United States)
- 1st Battalion, 7th Marines
- 1st Battalion, 8th Marines
- 1st Battalion, 9th Marines
- 1st Battalion, Arkansas State Troops
- 1st Battalion, Azad Kashmir Regiment
- 1st Battalion, Canadian Mounted Rifles, CEF
- 1st Battalion, Mississippi Mounted Rifles (Union)
- 1st Battalion, Parachute Regiment
- 1st Battalion, Royal Australian Regiment
- 1st Battalion, Sindh Regiment
- 1st Battalion, The Rifles
- 1st Battalion, Tower Hamlets Rifles
- 1st Battalion, Ulster Defence Regiment
- 1st Battle Squadron
- 1st Battlecruiser Squadron
- 1st Bavarian Landwehr Division
- 1st Bavarian Reserve Division
