St Giles' Cathedral, also known as the High Kirk of Edinburgh, is a historic church located on the Royal Mile in Edinburgh, Scotland. It is the Mother Church of Presbyterianism and has been one of the city's religious focal points for nearly 900 years. The cathedral was originally built in the 12th century, and has been renovated and expanded several times since.

The cathedral is named after Saint Giles, the patron saint of Edinburgh, who was a Greek hermit and saint of the 7th century. The present building dates from the 14th and 15th centuries, and is a remarkable example of Gothic architecture. Its most notable features include the ornate stonework of the nave, the beautiful stained glass windows, and the historic organ, which dates from the 17th century.

Throughout its history, St Giles' has played an important role in Scottish religion and politics. It was here that John Knox, the founder of Presbyterianism, preached his famous sermons, and the cathedral was a site of protest and political gatherings during the Scottish Reformation. It was also the location of the famous Scottish coronation of James VI in 1567, when he became King of Scotland.

Today, St Giles' Cathedral is still an active place of worship, and it welcomes visitors from all over the world who come to admire its history, architecture, and art. The cathedral is open to the public for guided tours, and visitors can also attend services, concerts, and other events throughout the year.