The Prague Astronomical Clock is a medieval astronomical clock in Prague, the capital of the Czech Republic. It is located on the southern wall of the Old Town City Hall on the Old Town Square and is a popular tourist attraction.

The Prague Astronomical Clock consists of three main parts: the astronomical clock face, which represents the position of the sun and the moon in the sky, showing various astronomical materials; the "Apostles Walking", which displays the apostles and other moving sculptures every hour; the lower calendar disk represents the month.