The Elenska Basilica or Elensko Basilica is a large partially preserved late Roman Christian basilica in west central Bulgaria. Dating to the 5th–6th century AD, it lies 5 to 6 kilometres northeast of Pirdop and 3 kilometres (1.9 mi) from Anton, on the right bank of the Elenska River in the Zlatitsa–Pirdop Valley. The initially domeless basilica, which features thick walls and defensive towers, had a dome added in the mid-6th century, during the reign of Justinian I. The church was ruined in the early 18th century, during the Ottoman rule of Bulgaria.