This is a list of known wars, conflicts, battles/sieges, missions and operations involving former kingdoms and states in the Indian subcontinent and the modern day Republic of India and its predecessors.
 (861–870)
 Kharijites
 Medieval India
 Ya'qub ibn al-Layth al-Saffar marched through Bost, Kandahar, Ghazni, Kabul, Bamyan, Balkh and Herat, conquering them in the name of Islam.
 (1175-1206)
 Sena dynasty
Soomra dynasty
Ghaznavids
Qarmatians
Tibetan tribes
 (1501)
 Arab privateers
 (1504)
 Vassal Malabari states
  Kingdom of Cochin
 (1505-1517)
 Kingdom of Calicut
 Bijapur Sultanate
  Gujarat Sultanate
 Supported by:
  Republic of Venice
  Ottoman Empire
 Kingdom of Calicut
 (1508)
 (1508–1573)
 Supported by:
 Kingdom of Calicut
  Mamluk Sultanate (until 1517)
  Ottoman Empire (since 1517)
 (1510)
 (1513)
 (1517)
 (1518–1658)
  Kingdom of Kandy
 Principality of Raigama
  Kingdom of Jaffna
 Supported by:
 Zamorin of Calicut
 Kingdom of Tanjore
 Vanni chieftains
  Dutch East India Company (From 1638)
  Kingdom of Kotte
 Supported by:
  Portuguese Empire
 (1570 – 1574)
  Sultanate of Ahmadnagar
 Zamorin of Calicut
  Sultanate of Aceh
 Co-belligerents:
 Princely states of the Kanara coast
 Kalinyamat Sultanate
 Sultanate of Ternate
 Sultanate of Tidore
 Sultanate of Golkonda
 Mappila Muslims
 (1586)
 (1599-1600)
 Kingdom of Calicut
 (1601–1661)
 Supported by:
 Supported by:
 (1612)
 (1624–1636)
  Dutch East India Company
 (1631-32)
 (1632)
 (1640)
 (1642-1698)
 (1666-1758)
  United Kingdom
  Portuguese Empire
 (1683–1684)
  Portuguese Empire
  Kahlur
  Garhwal
  Kangra
 Guler
 Hindur
 Siba
 Jaswan
  Akal Sena (Sikhs)
  Kangra State
 Bijarwal State
 (1692–1693)
  Portuguese Empire
  Portuguese Empire
 Coalition of 22 Hill States (Rajas)
 Coalition of 22 Hill States (Rajas)
 Coalition of 22 Hill States (Rajas)
 (1725–1726)
  Portuguese Empire
 (1729–1732)
  Portuguese Empire
 Supported by:
 Supported by: Rajahnate of Soonda Kingdom of Sawantwadi
 (1744–1748)
  Nizam of Hyderabad
 (1749–1754)
  Mughal Empire
 Kingdom of Mysore
  Nawab of Arcot (Chanda Sahib)
Hyderabad State (Muzaffar Jang Hidayat)
  Maratha Empire
  Nawab of Arcot (Wallajah)
 Hyderabad State (Nasir Jung)
 (1752)
  Austria
 Russia (until 1762)
 Spanish Empire (from 1761)
 Sweden (1757–62)
 Saxony
 Mughal Empire (from 1757)
  Great Britain
 Hanover
 Brunswick-Wolfenbüttel
 Iroquois Confederacy
 Portugal (from 1761)
 Hesse-Kassel
 Schaumburg-Lippe
 (1837–1838)
  East India Company
 Supported by:
  British Empire
 Aimaq tribesmen
 Maimana Khanate
 Andkhui Khanate
 Sheberghan Khanate
 Sar-i Pul Khanate
  Bukhara Emirate
  Khiva Khanate
 Supported by:
  Russian Empire
 Principality of Qandahar
  Afghanistan
 Following the Indian Rebellion of 1857, the rule of the British East India company came to end and the British crown began to rule over India directly as per the Government of India Act 1858. India was now a single empire comprising British India and the princely states.
  French Empire
  Egypt Ethiopia
  Tewfik Pasha
  France United States Germany Austria-Hungary Italy
  Russia Italy United States Serbia Montenegro Belgium Japan Romania Portugal Hejaz China Greece Brazil Kingdom of Nepal
  Japan Czechoslovakia Greece Poland United States France Romania Serbia Italy China
  France
  Armenia United Kingdom
  Istanbul Government
  Italy Georgia
  Kuva-yi Milliye
  Kuwait
  Australia New Zealand Egypt South Africa Free France Poland Greece Czechoslovakia
 Supported by: Germany
  Belgium
  Ethiopia
 Free France
 Supported by:
 Germany
 (1941)
  United Kingdom
  France Japan
 Azad Hind (with its Indian National Army) was a provisional government put in place in Japanese-occupied India by Netaji Subhas Chandra Bose with the help of Japan during World War II.
 In 1947, the British Indian Empire split into the Dominion of Pakistan and the Union of India. The Indian Army, the Royal Indian Air Force and the Royal Indian Navy too, were divided between the two countries. In 1950, the Union of India became the Republic of India after abolishing monarchy.
  United Nations United States United Kingdom Canada Turkey Australia Philippines New Zealand Thailand Ethiopia Greece France Colombia Belgium South Africa Netherlands Luxembourg
Supported by:
  North Korea
  China Soviet Union
Supported by:
  Republic of the Congo
 Supported by:
 Soviet Union (1960)
 ONUC
  Katanga South Kasai
Supported by: Belgium
 1960–62:
 Stanleyville government
Supported by: Soviet Union
  Myanmar (joined in 2018)
  BLTF
 HuM
 KLNLF
 KLO NDFB
 NSCN
 PLA
 ULFA
 UNLF
and others...
  Communist Party of India (Maoist)
  Communist Party of India (Marxist–Leninist) Janashakti
 Communist Party of India (Marxist–Leninist) Naxalbari (until 2014)
 Communist Party of United States of India
 Communist Party of India (Marxist–Leninist) New Democracy
 Communist Party of India (Marxist–Leninist) (Mahadev Mukherjee)
 People's Liberation Army of Manipur
 Purbo Banglar Communist Party
Centre of Indian Communists 
Tamil Nadu Liberation Army
 Supported by:
 Communist Party of Nepal (Maoist)
New People's Army
 Supported by:
 Soviet Union
 Supported by:
 United States
 United Kingdom
 China
 Iran
 Ceylon
 Saudi Arabia
  Australia Egypt India Pakistan Singapore Soviet Union United Kingdom United States Yugoslavia China
 Supported by: North Korea (alleged) ASBPI CCP (Maoist) (alleged)
 Supported by:  United Kingdom
  Soviet Union
 Supported by:  United Kingdom
  Soviet Union
 Supported by:  Pakistan  
 Military support:
 Supported by:
  Lashkar-e-Taiba
 Jaish-e-Mohammed  Harkat-ul-Mujahideen
 Al-Badr
 Jammu Kashmir Liberation Front
 Supported by:
 Pakistan
 Taliban
 al-Qaeda
 Non-UNMOT:
 (Part of the Somali Civil War)(1991–)
 Victory
 Non-NATO:
 Victory