马林堡（葡萄牙语：Castro Marim）是葡萄牙法鲁区的一座城市，位于地中海沿岸，邻近西班牙边境。

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Castro Marim (Portuguese pronunciation: [ˈkaʃtɾu mɐˈɾĩ]) is a town and a municipality in the southern region of Algarve, in Portugal. The population in 2011 was 6,747, in an area of 300.84 km².

The current Mayor is Francisco Amaral, elected by the Social Democratic Party.