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- sv: Kolmården (i fornsvenskan Colmark och Kulmark, antagligen av substantivet marker, skog; således "kolskogen"), bergs- och skogstrakt i Östergötland, Södermanland och Närke.
- en: Kolmården is a large forest that separates the Swedish provinces of Södermanland and Östergötland, two of the country's main agricultural areas, from each other. In early medieval times it was seen as a major obstacle in land travel between the regions, and so the Baltic Sea was largely used instead. Today the forest is traversed by the Norrköping–Nyköping railway, the Norrköping–Katrineholm railway, and the E4 highway, all connecting southern Sweden with Stockholm and the Mälaren region. Along the former there is also a Kolmården railway station, at the village of Krokek by Bråviken.