World War II (1939-1945)

Second Lebanon War (2006), the Israeli name for the 2006 Israel-Lebanon conflict

Second Sino-Japanese War (1937-1945)

Second Seminole War (1835-1842)

Second Boer War (1899-1902)

Second Punic War (218-202 BC)

Second Chechen War (1999-?)

Second Silesian War (1744), part of the War of the Austrian Succession

Second Congo War (1998-2004)

Second Bloody Valentine War

Second War of Scottish Independence (1328-1357)

Second War of Schleswig (1864)

Second Crusade (1145-1148)

Second Anglo-Dutch War (1665-1667)

Second Sudanese Civil War (1983-2005)

Second Cod War (1972-1973)

Second English Civil War (1648–1649)

Second Italo-Abyssinian War (1935-1936)

Warcraft II: Tides of Darkness, a computer game

Second Taranaki War (1864-1866)

Second Anglo-Sikh War (1848-1849)

Second Bishops' Wars (1640), part of the Bishops' Wars

Second Opium War (1856-1860)

Second Robotech War

Second Samnite War (326-304 BC), part of the Samnite Wars

Second Matabele War (1896-1897)

Second Balkan War (1913)

Second Italian War of Independence (1859)

Second Barbary War (1815)

Second Anglo-Mysore War (1780-1784)

Second Barons' War (1264–1267)

Second Liberian Civil War (1999-2003)

Second Burmese War (1853)

Second Zhili-Fengtian War (1924)

Second Italian War (1499–1504)

Second war of Kappel (1531)

Second Carlist War (1846-1849)

Second War against Napoleon (1812-1814)

Second Servile War (104-103 BC)

Second Macedonian War (200-196 BC)

Second Anglo-Maratha War (1803 - 1805)

Second Sacred War (449-448 BC)

Second Mithridatic War (83-82 BC)

Second Gulf War, one of three wars in the last two decades of the twentieth century and in the first decade of the twentieth first century

Second Civil War