The Grand Matsu Temple, also known as the Datianhou or Great Queen of Heaven Temple, is a temple to the Chinese Goddess Mazu, who is the Goddess of Sea and Patron Deity of fishermen, sailors and any occupations related to sea/ocean. The temple is located in the West Central District of Tainan on Taiwan.

Mazu or Matsu is a Chinese sea goddess in Chinese folk religion, Chinese Buddhism, Confucianism, and Taoism. She is also known by several other names and titles. Mazu is the deified form of Lin Moniang, a shamaness from Fujian who is said to have lived in the late 10th century. After her death, she became revered as a tutelary deity of Chinese seafarers, including fishermen and sailors. Her worship spread throughout China's coastal regions and overseas Chinese communities throughout Southeast Asia, where some Mazuist temples are affiliated with famous Taiwanese temples. Mazu was traditionally thought to roam the seas, protecting her believers through miraculous interventions. She is now generally regarded by her believers as a powerful and benevolent Queen of Heaven.