Annan District (Chinese: 安南區; pinyin: Ānnán Qū; Wade–Giles: An1-Nan2 Ch'ü1; Pe̍h-ōe-jī: An-Lâm-Khu) is a coastal district located in the west of Tainan, Taiwan. It was the largest district in Tainan City before the city was enlarged in 2010.