This Timeline of the British Army 1800–1899 lists the conflicts and wars the British Army were involved in.

• French Revolutionary Wars ended 1802
• Second Anglo-Maratha War 1802–1805
• Napoleonic Wars 1802–1813
• War of 1812 1812-1815
• Hundred Days 1815 The return of Napoleon
• Anglo-Nepalese War 1813–1816
• Third Anglo-Maratha War 1817–1818
• 5th Frontier War 1818
• First Ashanti War 1823–1831
• First Anglo-Burmese War 1824–1826
• First Anglo-Afghan War 1839–1842
• First Opium War 1839–1842
• First Anglo Marri War 1840
• First Anglo-Sikh War 1845–1846
• New Zealand Wars 1845–1872
• Second Anglo-Sikh War 1848–1849
• Second Anglo-Burmese War 1852–1853
• Crimean War 1853–1856
• Anglo-Persian War 1856–1857
• Second Opium War 1856–1860
• Indian Rebellion 1857–1858
• Second Ashanti War 1863–1864
• Bhutan War 1864–1865
• Third Ashanti War 1873–1874
• Second Anglo-Afghan War 1878–1880
• Anglo-Zulu War 1879
• Second Anglo Marri War 1880
• First Boer War 1880–1881
• Third Anglo-Burmese War 1885
• Mahdist War 1881–1899
• Fourth Ashanti War 1894
• Anglo-Zanzibar War 1896 Shortest war in history lasted 38 minutes
• Six-Day War 1899
• Boxer Rebellion 1899–1901
• Second Boer War 1899–1902

See also

• Timeline of the British Army
• Timeline of the British Army 1700–1799
• Timeline of the British Army 1900–1999
• Timeline of the British Army since 2000