42nd Battalion may refer to: 42nd Virginia Cavalry Battalion, a unit of the Confederate States Army Robin Hood Battalion, (42nd (The Robin Hoods, Sherwood Foresters) Anti-Aircraft Battalion), a unit of the United Kingdom Army 42nd (East Lancashire) Infantry Division (42 Battalion Machine Gun Corps), a unit of the United Kingdom Army 42 Commando, a unit of the United Kingdom Royal Marine Corps 42nd Battalion (Australia), a unit of the Australian Army which served in World War I and World War II 42nd Battalion (Royal Highlanders of Canada), CEF, an infantry battalion of the Canadian Expeditionary Force during World War I 42nd Battalion, CEF, reserve infantry regiment of the Canadian Army 42nd Battalion, Singapore Armoured Regiment, one of the 4 armoured infantry battalions of the Singapore Army
See also 42nd Division (disambiguation) 42nd Brigade (disambiguation) 42nd Regiment (disambiguation) 42nd Squadron (disambiguation) 42nd Group (disambiguation)