The Old Summer Palace, also known as Yuanmingyuan or Yuanmingyuan Park, originally called the Imperial Gardens, and sometimes called the Winter Palace, was a complex of palaces and gardens in present-day Haidian District, Beijing, China. It is 8 kilometres (5 mi) north-west of the walls of the former Imperial City section of Beijing. Widely perceived as the pinnacle work of Chinese imperial garden and palace design, the Old Summer Palace was known for its extensive collection of gardens, its building architecture and numerous art and historical treasures. Constructed throughout the 18th and early 19th centuries, the Old Summer Palace was the main imperial residence of Qianlong Emperor of the Qing dynasty and his successors, and where they handled state affairs; the Forbidden City was used for formal ceremonies. The Garden was reputed as the "Garden of Gardens" in its heyday was "arguably the greatest concentration of historic treasures in the world, dating and representing a full 5,000 years of an ancient civilization", according to Robert McGee, chaplain to the British forces.

Haidian District is an urban district of the city of Beijing. It is mostly situated in northwestern Beijing, but also to a lesser extent in the west, where it has borders with Xicheng and Fengtai.