The Puerta del Sol (English: "Gate of the Sun") is a public square in Madrid, one of the best known and busiest places in the city. This is the centre (Km 0) of the radial network of Spanish roads. The square also contains the famous clock whose bells mark the traditional eating of the Twelve Grapes and the beginning of a new year. The New Year's celebration has been broadcast live since 31 December 1962 on major radio and television networks including Atresmedia and RTVE.

The Puerta del Sol originated as one of the gates in the city wall that surrounded Madrid in the 15th century. Outside the wall, medieval suburbs began to grow around the Christian Wall of the 12th century. The name of the gate came from the rising sun which decorated the entry, since the gate was oriented to the east.