This article provides a list of wars occurring between 1800 and 1899. Conflicts of this era include the Napoleonic Wars in Europe, the American Civil War in North America, the Taiping Rebellion in Asia, the Paraguayan War in South America, the Zulu War in Africa, and the Australian frontier wars in Oceania.
1800–1809
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{| class="wikitable sortable" width="100%"
! rowspan="2" width="46" | Start
! rowspan="2" width="40" | Finish
! rowspan="2" class="unsortable" | Name of conflict
! colspan="2" class="unsortable" | Belligerents
|-
! Victorious party (if applicable)
! Defeated party (if applicable)
|-
|1800
|1865
|Temne War
|<br />Susu Tribes
|Kingdom of Koya
|-
|1801
|1805
|Tripolitan War
|<br /> Sweden (until 1802)<br /> Sicily
| Tripolitania<br /> Morocco (1802)
|-
|1801
|1801
|War of the Oranges<br />Part of the War of the Second Coalition
|
Spain
|
|-
|1802
|1804
|Fourth quarter of the Haitian Revolution
| Haiti
|
|-
|1802
|1802
|Sack of Karbala
| Diriyah
| Ottoman Empire
|-
|1802
|1802
|Stecklikrieg
|
|Federalist rebels
|-
|1802
|1810
|Tedbury's War
|
|Australian Aborigines
|-
|1803
|1803
|Souliote War
| Ottoman Empire
|Souliotes
|-
|1803
|1803
|Irish Rebellion of 1803
|
| Society of United Irishmen
|-
|1803
|1805
|Second Anglo-Maratha War
| British East India Company
|
|-
|1803
|1805
|Burmese–Siamese War (1803–05)
| Konbaung dynasty
| Siam
|-
|1803
|1805
|First Kandyan War
|
| Kingdom of Kandy
|-
|1803
|1815
|Napoleonic Wars
|