20th Regiment

20th Regiment may refer to:

Infantry regiments

 * 20th Infantry Regiment (United States)
 * 20th Regiment of Bengal Native Infantry, an East India Company unit
 * 20th Duke of Cambridge's Own Infantry (Brownlow's Punjabis), a British Indian Army unit
 * 20th Continental Regiment, a Continental Army unit
 * 20th Regiment of Foot, a British Army unit

Union (Northern) regiment

 * 20th Connecticut Infantry Regiment
 * 20th Illinois Infantry Regiment
 * 20th Indiana Infantry Regiment
 * 20th Iowa Volunteer Infantry Regiment
 * 20th Kansas Militia Infantry Regiment
 * 20th Regiment Kentucky Volunteer Infantry
 * 20th Maine Volunteer Infantry Regiment
 * 20th Regiment Massachusetts Volunteer Infantry
 * 20th Michigan Volunteer Infantry Regiment
 * 20th New York Volunteer Infantry Regiment
 * 20th Pennsylvania Infantry
 * 20th Wisconsin Volunteer Infantry Regiment

Confederate (Southern) regiments

 * 20th Arkansas Infantry Regiment
 * 20th Tennessee Infantry Regiment
 * 20th Virginia Infantry

Other regiments

 * 20th Marine Regiment (United States)
 * 20th Field Artillery Regiment, RCA, Royal Canadian Artillery
 * 20th Field Artillery Regiment (United States)
 * 20th Hussars, a cavalry regiment of the British Army
 * 20th Lancers (Pakistan), an armoured regiment
 * 20th Light Dragoons, a cavalry regiment of the British Army
 * 20th Surveillance and Target Acquisition Regiment, Royal Australian Artillery