List of Wars during the 20th century

The following combats occurred during the 20th century, which began on 1 Jan 1900 and ended on 31 Dec 1999.

Italic Years are years that are not part of the 20th century, but rather part of the 19th century (Before 1900) or 21st century (After 1999).

1900s

 * The Boxer Rebellion (1900)
 * Sino-Russian War (1900)
 * Second Boer War (1899 - 1902)
 * Philippine insurrection (1899 - 1902)
 * The War of a Thousand Days (1899 - 1903)

1990s

 * Sierra Leone Civil War (1991 - 2000)