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

American Civil War regiments

Union (Northern) regiment

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

Confederate (Southern) regiments

• 20th Arkansas Infantry Regiment
• 20th Tennessee Infantry Regiment
• 20th Virginia Infantry Regiment

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