The Xiyu Eastern Fort () or Xiyu Eastern Battery ( XëyàDà Âng Pàotái, informally Dà Ângtái GÃÂbÃÂo) is a former fort and battery in Wai'an Village, Xiyu Township, Penghu, Taiwan.
In the 17thcentury, Chinese Ming Dynasty loyalist general Chen Guoxuan () built 15batteries in Penghu to guard against Qing dynasty admiral Shi Lang. Many of the batteries were destroyed during the Sino-French War of 1884 and 1885, when Penghu was one of the main theaters of conflict. Following the war, Qing governor of Taiwan Liu Mingchuan ordered four batteries built in Penghu in 1887. Xiyu Eastern Fort was constructed in 1889 during Qing Dynasty rule of Taiwan. It was constructed to consolidate the coastal area of Penghu.
The fort was built in a U-shape structure facing the sea which spreads over an area of 7 hectares. It was fully constructed by gray building.