Muro Dam

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| name = Muro Dam

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| location = Campo Maior, Portalegre District, Portugal

| dam_length = 174 m

| dam_height = 4.6 m

| dam_width_base = 4.2 m

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| opening = Roman period

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The Muro Dam was a Roman dam in Portugal. Located near the eastern municipality of Campo Maior, it is the largest surviving ancient dam in the country south of the Tagus river.{{harnvb|Decker|1991|pp=78–79 (no. 4)}}

The 174 m long structure features three slight bends in its course. Its downstream side is supported by a series of thirteen small buttresses at intervals of 3–4 m. The central section, where the dam is highest and strongest, is further strengthened on its air-side by three vertical arches which go from buttress to buttress.