Mawei (simplified Chinese: 马尾; traditional Chinese: 馬尾; pinyin: Mǎwěi; Foochow Romanized: Mā-muōi) is one of 6 urban districts of the prefecture-level city of Fuzhou, the capital of Fujian Province, China. The district spans an area of 319.66 square kilometers, of which, 275.66 square kilometers is land. The district had a population of 290,554 as of 2020.

Mawei District is located on the north bank of the Min River, between Fuzhou's urban core and the coast of the East China Sea. The district also includes Langqi Island formed by the two main branches of the Min River as it flows into the sea.

Mawei District is famous for its historical Mawei Arsenal, with a modern shipyard operating on the site.

The district is named after the nearby Mawei River (Chinese: 马尾江).

While serving as the Viceroy of Min-Zhe, Zuo Zongtang established the Fujian Shipping Academy [zh] in 1866. The academy subsequently constructed the Mawei Arsenal, and ran a naval education program which incorporated western-style education and shipbuilding.

In 1913, the area was organized as Majiang Town (Chinese: 马江镇). Majiang Town was renamed to Mawei Town (Chinese: 马尾镇) in 1951. In 1956, Mawei Town was re-organized as Mawei District (Chinese: 马尾区), but was re-organized once again in 1958 as the Mawei People's Commune (Chinese: 马尾人民公社). Mawei District was re-established in March 1960, and lasted until 1969, when it was re-organized as the Mawei People's Commune.

In August 1982, Mawei was re-organized as a district, which it remains as today. On December 15, 1995, the district underwent boundary changes.

The district sits on the northern bank of the Min River, and lies approximately 17 nautical miles from its mouth. It is bordered by the Min River to the east, Jin'an District to the west, Cangshan District and Changle District on the other side of the Min River to its south, and Lianjiang County to its north. Qingzhou Bridge spans the river, connecting Mawei's main urban center with Changle District.