A
- Battle of Aachen - 1944 - Second World War
- Battle of Abensberg - 1809 - Napoleonic Wars
- Battle of Abukir - 1799 - French Revolution
- Battle of Abu Klea - 1885 - Mahdist War
- Battle of Aclea - 851 - Danish Invasions of Britain
- Battle of Acragas - 406 BC - Carthaginian Invasion of Sicily
- Siege of Acre (1189-1191) - Third Crusade
- Siege of Acre (1291) - Fall of the last crusader city
- Siege of Acre (1799) - The French Revolution
- Battle of Acroinum - 740 - Byzantine–Arab Wars
- Battle of Actium - 31 BC - Wars of the Second Triumvirate
- Battle of Adana - 964 - Byzantine–Arab Wars
- Battle of Adwa - 1896 - First Italo–Ethiopian War
- Battle of Adwalton Moor - 1643 - English Civil War
- Battle of Aegina - 458 BC- First Peloponnesian War
- Battle of Aegospotami - 405 BC - Peloponnesian War
- Battle of Agendicum - 52 BC - Gallic Wars
- Battle of Agincourt - 1415 - Hundred Years' War
- Battle of Agnadello (a.k.a. Battle of Vaila) - 1509 - Italian Wars
- Battle of Ahvenanmaa - 1714 - Great Northern War
- Battle of Ain Jalut - 1260 - Mameluk-Mongol Wars
- First Battle of the Aisne - 1914 - World War I
- Second Battle of the Aisne - 1917 - World War I
- Third Battle of the Aisne - 1918 - World War I
- Battle of Ajnadayn - 634 - Muslim conquest of Syria
- Battle of Akraba (632) (a.k.a. Battle of Yemama) - Recovery of Arabia - Campaign of Khalid
- Battle of Akraba (1972) - Israeli defoliation of Arab wheat crops
- Battle of Alalia - 535 BC - Greek-Punic Wars
- Battle of Alamance - 1771 - Colonial Wars of the United States
- Battle of the Alamo - 1836 - Texas Revolution
- Battle of Aldenhoven (1794) - Wars of the French Revolution
- Battles of El Alamein - both 1942 - World War II
- First Battle of El Alamein
- Second Battle of El Alamein
- Battle of Alesia - 52 BC - Gallic Wars
- Battle of Alfarrobeira - 1449 - Portuguese War of rebellion
- Battle of Algeciras - 1344 - Spanish-Moslem Wars
- Battle of Alma - 1854 - Crimean War
- Battle of Almonacid - 1809 - Napoleonic Empire Wars
- Battle of Al-Safra - 1812 - Ottoman-Saudi War
- Battle of Amberg - Wars of the French Revolution
- Battle of Amiens - 1870 - Franco-Prussian War
- Battle of Amiens - 1918 - World War I
- Battle of Amphipolis - 422 BC - Peloponnesian War
- Battle of Amstetten - 1805 - War of the Third Coalition
- Battle of Ankara (a.k.a. Battle of Angora) - 1402 - Timur's Invasion of Turkey
- Battle of Antietam - 1862 - American Civil War
- Battle of Antioch (1097) - First Crusade
- Battle of Antioch (1119) - Crusader-Turkish Wars
- Battle of Antioch (1268) - Crusader-Turkish Wars
- Battle of Antwerp (1584) - Netherlands' War of Independence
- Battle of Antwerp (1914) - World War I
- Battle of Antwerp (1944) - World War II
- Battle of Anzen - 838 - Byzantine–Arab Wars
- Battle of Aong - 1857 - Indian Mutiny
- Battle of Araure - 1813 - Venezuelan War of Independence
- Battle of Arbedo - 1422 - Milanese led by Francesco Bussone vs. Swiss
- Battle of Arcole (1796) - Wars of the French Revolution
- Battle of Arcis-sur-Aube - 1814 - Napoleonic Empire Wars
- Battle of Ardennes - World War I
- Battle of Arklow - 1798 - Irish Rebellion of 1798
- Battle of Arnhem - 1944 - World War II (Operation Market Garden)
- Battle of Arras (1654) - Thirty Years' War (Spanish-French extension)
- Battle of Arras (1917) - World War I
- Battle of Arsuf - 1191 - Third Crusade
- Battle of Artemisium - 480 BC - Persian Wars
- Battle of Artois-Loos - 1915 - World War I
- Battle of Asal Uttar - 1965 - Indo-Pakistani War of 1965
- Battle of Ascalon - 1099 - First Crusade
- Battle of Ashdown - 871 - Viking-Saxon wars
- Battle of Athens (Alabama) - 1864 - American Civil War
- Battle of Athens (Missouri) - 1861 - American Civil War
- Battle of Auerstaedt - 1806 - Napoleonic Empire Wars
- Battle of Austerlitz - 1805 - Napoleonic Empire Wars
- Battle of the Atlantic - World War I
- Battle of the Atlantic - World War II
- Battle of Auberoche - 1345 - Hundred Years War
- Battle of Audenaarde - 1708 - War of the Spanish Succession
- Battle of Azaz (1030) - Byzantine–Arab Wars
- Battle of Azaz (1125)
Read more about this topic: List Of Battles (alphabetical)