马江（越南语：Sông Mã／泷马）是越南和老挝的一条河流，全长512公里，其中越南段410公里、老挝段102公里。

马江有两源。其一位于越南西北的奠边省南的巡教山（núi Tuần Giáo），发源后向东南流经山罗省马江县进入老挝境内，后又入越南境内。第二源位于老挝Bambusao山腰，后进入越南。汇合后的马江经过越南清化省，继续向东南方向流淌，经过清化省北的诸县，与支流周江（sông Chu）汇合后分两支流入北部湾，北支称摙江（sông Lèn），南支称马江。

马江流域面积28,400 km²，位于越南境内的有17,600 km²。平均海拔762米，平均比降17.6%，流域内河流密度0.66 km/km²。 年平均流量为52.6 m³/s。

The Ma River (Vietnamese:Sông Mã, Lao: Nam Ma) is a river in Asia, originating in northwestern Vietnam. It runs for 400 km through Vietnam, Laos, and then back through Vietnam, meeting the sea at the Gulf of Tonkin.

The largest tributaries of the Ma River are the Chu River (or the Nam Sam River as it is called in Laos), the Bưởi River, and the Cầu Chày River. All of them join the Ma River in Thanh Hóa Province in North Central Vietnam.