43rd Battalion

43rd Battalion may refer to:


 * 43rd Battalion (Australia), an infantry battalion of the Australian Imperial Force that served during World War I
 * 2/43rd Battalion (Australia), an infantry battalion of the Second Australian Imperial Force that served during World War II
 * 43rd (6th (City) Battalion, The Royal Northumberland Fusiliers) Royal Tank Regiment, a unit of the United Kingdom Army
 * 43rd Battalion Virginia Cavalry, also known as "Mosby's Rangers", a unit of the Confederate (Southern) Army during the American Civil War
 * 43rd Signal Battalion (United States), a unit of the United States Army
 * 43rd Battalion (Cameron Highlanders of Canada), CEF