St. Mark's Church is a historic church located in the Upper Town area of Zagreb, Croatia. The church was originally built in the 13th century and has undergone numerous renovations and expansions throughout the centuries. It is renowned for its colorful tiled roof, which features the coats of arms of Croatia, Dalmatia, and Slavonia on one side and the emblem of Zagreb on the other.

The church's interior is equally impressive, featuring numerous altars, paintings, and sculptures. The most notable feature is the altar of the Holy Cross, which was crafted by the renowned Croatian sculptor Ivan Mestrovic. The church also houses a number of valuable artifacts, including a 14th-century Gothic crucifix and a 17th-century wooden statue of St. Mary.

St. Mark's Church is a popular destination for tourists and locals alike, and it is also an important cultural and political symbol. The church is located adjacent to the Croatian Parliament building, and it has been the site of numerous important political events throughout history. It is also a popular site for national celebrations and ceremonies, and it is often featured in images and representations of Zagreb and Croatia as a whole.