This is a list of wars involving the Kingdom of Thailand, its predecessor states, and by Siamese people, from antiquity to the present day. It also includes wars fought outside Thailand by Thailand military.
 Location:Champa
 Trần dynasty 
 Location: Northern Ayutthaya, Southern Lan Na[full citation needed]
 Location: Upper Tenessarim coast, western and central Siam
 Location: Ayutthaya, Phitsanulok, Sukhothai
 Location: Ayutthaya, Phitsanulok, Kamphaeng Phet and Lan Xang 
 Location: Ayutthaya Kingdom and lower Tanintharyi Region
 Location: Cambodia
 Location: Southern and central Burma
 Location: upper Tenasserim coast and Lan Na 
 (1624–1636)
  Dutch East India Company
 Location: Northern Siam and Tenasserim coast
 Location: Tenasserim coast
 Location: Mergui and Coromandel coast 
 Location: Bangkok, Thailand 
 Location: Ayutthaya Kingdom
 Location: Cambodia
 Location: Tenasserim, Siam
 Location: Tenasserim coast, Gulf of Siam coast, Suphanburi, Ayutthaya
 Location: Siam
 Location: Cambodia, Southern Vietnam
 Location: Northern and central Siam, Lan Na
 Location: Khorat Plateau
 Location: Rạch Gầm River and Xoài Mút River, Southern Vietnam
 Location: Western Siam
 Location:Tenasserim Coast
 Location:Tenasserim Coast
 Location: Lanna Kingdom, Northern Thailand
 Location: Lanna Kingdom, Northern Thailand
 Location: Phuket
 Location: Cambodia, Southern Vietnam
 Vietnamese forces restore Ang Chan to the Cambodian throne
 Location: Kedah
 Location: Burma, East Bengal, Manipur
 Location: Central Laos
 Location: Cambodia, Southern Vietnam
 Location: Cambodia, Cochinchina
 Siamese interventionCambodia independence from VietnamCambodia came under joint Siamese-Vietnamese suzerainty
 Location: Cambodia, Southern Vietnam
 Location: Kengtung, Trans-Salween region
 Location: Eastern Cambodia, 
 Location: French Indochina, Siam
 Location: Phrae
 Location: Europe
 Location: French Indochina
 Location:Thailand
 Location: Southeast Asia
 Location: Malay Peninsula, Southeast Asia
  Australia New ZealandSupported by: Thailand(Thai–Malaysian border)
 Supported by: China Viet Minh(until 1954) North Vietnam(from 1954) Soviet Union Indonesia
 Location: Korean Peninsula, Yellow Sea, Sea of Japan, Korea Strait, China–North Korea border
  United Nations
 Location: South Vietnam, North Vietnam, Cambodia, Laos, South China Sea, Gulf of Thailand
 Location: Kingdom of Laos
 Location: Thailand (primarily East Thailand)
 Supported by:
  Taiwan (until July 1981)
  United States[citation needed]
  Pathet Lao[citation needed]
 Supported By:
  Khmer Rouge (until 1982)[citation needed]
 Vietnam 
 China (from 1979)
 Soviet Union
 Location: Cambodia
  North Vietnam Việt Cộng
 Location: Malaysian Peninsular and Sarawak
 Supported by: United Kingdom Australia New Zealand United States South Vietnam (until 1975)
  Malayan Communist Party
  Communist Party of Thailand (until 1983)
Supported by: China Soviet Union Vietnam (until late 1970s) North Kalimantan Communist Party
 Location: Vietnam, Laos, Cambodia, Thailand, China
  Lao royalistsHmong insurgents FULRO Thailand
Supported by: United States North Korea
 Supported by: Warsaw Pact countries (until 1991)
 Location: Thai–Cambodian border, Gulf of Thailand
 Supported by: United States China
 Location: Chat Trakan District, Phitsanulok Province, ThailandBotene District, Sainyabuli Province, Lao PDR
 Location: Iraq, Kuwait, Saudi Arabia andthe Persian Gulf
 Location: East Timor
 International Force:
  Iraq  United States United Kingdom
 Supported by: Iran
  Iraqi Kurdistan
  Sunni insurgents
  Shia insurgents
 Supported by: Iran
  Islamic State
 Oil smugglers
 Pirates
 Location: Thai–Cambodian border