The Battle of Sardarabad was a battle of the Caucasus campaign of World War I that took place near Sardarabad, Armenia, from 21 to 29 May 1918, between the regular Armenian military units and militia on one side and the Ottoman army that had invaded Eastern Armenia on the other. As Sardarabad is approximately 40 kilometres (25 mi) west of the capital of Yerevan, the battle not only halted the Ottoman advance into the rest of Armenia, but also prevented the complete destruction of the Armenian nation. The battle paved the way for the establishment of the First Republic of Armeniaand the Treaty of Batum: recognition of Armenia by the Ottoman Empire.

The Caucasus campaign comprised armed conflicts between the Russian Empire and the Ottoman Empire, later including Armenia, Azerbaijan, Georgia, the Mountainous Republic of the Northern Caucasus, the German Empire, the Central Caspian Dictatorship, and the British Empire, as part of the Middle Eastern theatre during World War I. The Caucasus campaign extended from the South Caucasus to the Armenian Highlands region, reaching as far as Trabzon, Bitlis, Mush and Van. The land warfare was accompanied by naval engagements in the Black Sea.