Glasgow Cathedral, also known as St. Mungo's Cathedral, is a medieval church located in the city of Glasgow, Scotland. It is the oldest building in Glasgow, with parts of the cathedral dating back to the 12th century.

The cathedral was built on the site where St. Mungo, the patron saint of Glasgow, is believed to have been buried in the 7th century. The current building was constructed between the 13th and 15th centuries in the Gothic style, with later additions and alterations.

One of the most notable features of the cathedral is its stunning stained-glass windows, which include a series of modern windows designed by Scottish artist John K. Clark. The cathedral also contains a number of important artifacts, including the 15th-century Blackadder preaching cross and the tomb of St. Mungo.

In addition to its religious significance, Glasgow Cathedral has played an important role in Scottish history. It was the site of numerous battles and sieges, and was used as a hospital and barracks during the Jacobite risings of the 18th century.

Today, the cathedral is still an active place of worship and is open to visitors for tours and services. It is a popular tourist attraction and a symbol of Glasgow's rich history and cultural heritage.