Beimen District (Chinese: 北門區; pinyin: Běimén Qū; Pe̍h-ōe-jī: Pak-mn̂g-khu) is a coastal district of about 10,191 residents in Tainan, Taiwan.

[1] After the handover of Taiwan from Japan to the Republic of China in 1945, Beimen was organized as a rural township of Tainan County.

On 25 December 2010, Tainan County merged with Tainan City and Beimen was upgraded to a district of the city.

Beimen is divided into Beimen, Yonglong, Yonghua, Yugang, Baoji, Tungbi, Kunjiang, Shuangchun, Jinhu, Cian, Sanguang, Zhongshu and Renli Villages.

Provincial Highway 61 also runs through the district.