Pabaiskas is a small town in Ukmergė district of Vilnius County, Lithuania, 10 kilometres (6.2 mi) south-west of Ukmergė, with 249 inhabitants. The Battle of Pabaiskas took place here in 1435, when Sigismund Kestutaitis defeated Švitrigaila and his Livonian Order allies. Pabaiskas was built afterwards to commemorate the battle.