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Joseon era palace in Seoul, South Korea

Changdeokgung (hangul=창덕궁), also known as Changdeokgung Palace or Changdeok Palace, is set within a large park in Jongno District, Seoul, South Korea. It is one of the "Five Grand Palaces" built by the kings of the Joseon dynasty (1392–1897). As it is located east of Gyeongbok Palace, Changdeokgung—along with Changgyeonggung—is also referred to as the "East Palace" (hangul=동궐). Changdeokgung was the most favored palace of many Joseon kings and retained many elements dating from the Three Kingdoms of Korea period that were not incorporated in the more contemporary Gyeongbokgung. One such element is the fact that the buildings of Changdeokgung blend with the natural topography of the site instead of imposing themselves upon it. Like the other Five Grand Palaces in Seoul, it was heavily damaged during the Japanese occupation of Korea (1910–1945). Currently, only about 30% of the pre Japanese structures of the East Palace Complex (Changdeokgung together with Changgyeonggung) survive.

Changdeokgung was the second palace after Gyeongbokgung which had been established in 1395 as a primary palace. In the midst of strife for the throne between princes and vassals, authority of Gyeongbokgung was deteriorated. King Jeongjong enthroned by Prince Jeong an (Yi Bang won), who later became King Taejong, moved the capital to Gaegyeong, the capital of the Goryeo dynasty, again in 1400 on the pretext of its superior geographical features, but in fact, to avert a power struggle. King Taejong (Yi Bang won) soon took over the throne and returned to Hanseong (present day Seoul). Taejong was reluctant to build Gyeongbokgung Palace, which had been built by his political opponent Jeong Do jeon, as well as being the place where he had killed his half brothers for the throne, and therefore built new palace (named Changdeokgung). Construction of Changdeokgung began in 1405, and was completed in 1412. King Seonjo expanded the palace grounds by about 500,000 square meters, including Huwon (see below). The palace was burnt to the ground during the Japanese invasion in 1592 by crowd and reconstructed in 1609 by King Seonjo and King Gwanghaegun. The palace burned down again in 1623 because of King Injo a political Revolt against Gwanghaegun. The palace was also attacked by the Manchu Qing but throughout its history of reconstruction and repair has remained faithful to its original design. Changdeokgung was the site of the royal court and the seat of government until 1868, when the neighboring Gyeongbokgung was rebuilt. Korea's last Emperor, Sunjong lived here until his death in 1926. Parts of the palace (notably Nakseon jae hall) continued to function as a royal residence up to 1989, when both Princess Deokhye and Crown Princess Bangja died. Other post WWII residents included Empress Sunjeong (Sunjong's second wife), Crown Prince Yi Un, his son Yi Gu and Yi Gu's wife Julia Mullock. However, residence in the palace in the post war period was at the whim of the republican leaders, and after the Korean liberation in 1945 it would take the resignation of Rhee Syngman for former imperial family members to be allowed back in. Today there are 13 buildings remaining on the palace grounds and 28 pavilions in the gardens, occupying 110 acres (45 hectares) in all and the area is designated as Historical Site No. 122. Buildings of note include Donhwamun (built in 1412, rebuilt in 1607, with a copper bell weighing 9 short tons or 8 metric tons), Injeongjeon (main hall), Seongjeongjeon (auxiliary office in the main hall), Huijeongdang (the king's private residence, later used as a conference hall), Daejojeon (living quarters), and Nakseon jae.

Behind the palace lies the 78 acre (32 ha) Huwon (후원, 後苑, Rear garden) which was originally constructed for the use of the royal family and palace women. The garden incorporates a lotus pond, pavilions, and landscaped lawns, trees, and flowers. There are over 26,000 specimens of a hundred different species of trees in the garden and some of the trees behind the palace are over 300 years old. The garden for the private use of the king had been called 'Geumwon' (금원, 禁苑, Forbidden garden) because even high officials were not allowed to enter without the king's permission. It had also been called 'Naewon' (내원, 內苑, 'Inner garden'). Today Koreans often call it 'Biwon' (비원, 秘院, Secret garden) which derived from the office of same name in the late 19th century. Though the garden had many other names, the one most frequently used through Joseon dynasty period was 'Huwon'. In September 2012, the Buyongjeong pavilion in the garden was re opened after a year long restoration project. The pavilion was restored based on the Donggwoldo from 1820, National Treasures of South Korea No. 249. A variety of ceremonies hosted by the king were held in Huwon. In the early period of the Joseon dynasty, military inspections in which the king participated were often held here. King Sejo had troops parade and array before him or commanded them by himself in the garden. In addition, feasts were given, archery tournaments held, and fireworks enjoyed in Huwon. The Ongnyucheon (옥류천, 玉流川, "Jade Stream") area is of particular interest. It contains a U shaped water channel carved in 1636 for floating wine cups, with a small waterfall and an inscribed poem on the boulder above it. The area also contains five small pavilions.

Changdeokgung was added to the UNESCO World Heritage List in 1997. The UNESCO committee stated the place was an "outstanding example of Far Eastern palace architecture and garden design" being exceptional because the buildings are "integrated into and harmonized with the natural setting" and adapted "to the topography and retaining indigenous tree cover." Portions of the palace were used to film the hugely popular Korean drama Dae Jang Geum in the first decade of the 21st century.

From April to October 2018, Changdeokgung hosted the 2018 Changdeok Palace moonlight tour. Changdeok Palace moonlight tours are special events where visitors can experience life at the palace. It typically took about two hours and starts at Donhwamun Gate, the main gate of Changdeokgung, at 8 p. m.