The Church of Saint John (Surp Hovanes), also known as Mastara Church, in Mastara, Armenia dates from the 5th century. It features a variation of the cruciform plan and central cupola'd church. In accordance with its square plan, the four projecting apses, inward-facing circular and outward facing polygonal, offer the requisite supports to hold up the imposing polygonal cupola. The complex church designs are like those in Avan and St. Hripsime Church, Echmiadzin.

Church of Saint John Սուրբ Յովհաննես Եկեղեցի
St. John Church of Mastara, October 2014 View from the southwest
Religion
Affiliation	Armenian Apostolic Church
Location
Location	Mastara, Aragatsotn Province, Armenia
Shown within Armenia Show map of Armenia Church of Saint John, Mastara (Aragatsotn) Show map of Aragatsotn
Geographic coordinates	40°27′06″N 43°53′02″E / 40.451631°N 43.883883°E / 40.451631; 43.883883
Architecture
Style	Armenian
Completed	5th century

The works of medieval architecture in Mastara include, among others, numerous khachkars.