XXI Corps is a corps

Corps

A corps is either a large formation, or an administrative grouping of troops within an armed force with a common function such as Artillery or Signals representing an arm of service...

 of the Indian Army

Indian Army

The Indian Army is the land based branch and the largest component of the Indian Armed Forces. With about 1,100,000 soldiers in active service and about 1,150,000 reserve troops, the Indian Army is the world's largest standing volunteer army...

. It is the only strike corps in Army’s Poona-based Southern Command. After India's intervention in Sri Lanka, the provisional HQ controlling India's expeditionary force, HQ Indian Peace Keeping Force

Indian Peace Keeping Force

Indian Peace Keeping Force was the Indian military contingent performing a peacekeeping operation in Sri Lanka between 1987 and 1990...

, became HQ XXI Corps in April 1990. It was then moved to Bhopal. This is both a strike corps and would also be used if India were to make another big intervention overseas.

It currently consists of:

• 31st Armored Division
  31st Indian Armoured Division
  The 31st Indian Armoured Division was an armoured formation of the Indian Army during World War II, formed in 1940, as 1st Indian Armoured Division; it consisted of units of the British Army and the British Indian Army...
  
   (White Tiger Division) headquartered at Jhansi
  Jhansi
  Jhansi Hindi:झाँसी, , Marathi: झाशी, is a historical city of India. Jhansi is the administrative headquarters of Jhansi District and Jhansi Division. The original walled city grew up around its stone fort, which crowns a neighboring rock. This district is on the bank of river Betwa.The National...
  
  -Babina in Uttar Pradesh
  Uttar Pradesh
  Uttar Pradesh abbreviation U.P. , is a state located in the northern part of India. With a population of over 200 million people, it is India's most populous state, as well as the world's most populous sub-national entity...
  
  , Central India. 94 Armoured Brigade may be part of the division; it is part of the Strike Corps, and has taken part in exercises with the Singaporean Army under the direction of 31 Armoured Division.
• 36th Infantry Division (Reorganised Army Plains Infantry Division) Sagar. In 2001, the Division Artillery Brigade was at Talbehat
  Talbehat
  Talbehat' is a small city and a nagar panchayat in Lalitpur district in the Indian state of Uttar Pradesh.-Demographics: India census, Talbehat had a population of 22,664. Males constitute 52% of the population and females 48%. Talbehat has an average literacy rate of 65%, higher than the national...
  
  , 18 Armoured Brigade at Gwalior, 72 Infantry Brigade at Gwalior, and 115 Infantry Brigade
  115th Indian Infantry Brigade
  The 115th Indian Infantry Brigade is an Infantry formation of the Indian Army.It was initially formed during World War II, in September 1943, as a training brigade of the 39th Indian Infantry Division....
  
   was at Dhana
  Dhana
  Dhana is a census town in Sagar district in the state of Madhya Pradesh, India.-Demographics: India census, Dhana had a population of 10,295. Males constitute 61% of the population and females 39%. Dhana has an average literacy rate of 96%, higher than the national average of 59.5%: male literacy...
  
  .
• 54th Infantry Division headquartered at Hyderabad/Secunderabad
  Secunderabad
  Secunderabad popularly known as the twin city of Hyderabad is located in the Indian state of Andhra Pradesh north of Hyderabad. Named after Sikandar Jah, the third Nizam of the Asaf Jahi dynasty, Secunderabad was founded in 1806 AD as a British cantonment...
  
   91 Infantry Brigade at Trivandrum is an amphibious brigade. 47 Infantry Brigade was part of 54 Division during Exercise Tri Shakti in 1986, exercising the air assault role.
• ? Artillery Brigade
• Air defence brigade
• 475 Engineering Brigade