Jamno ( ; ) is a lake in West Pomeranian Voivodeship, Poland. It is divided from the Baltic Sea by a spit, on which lie the resorts of Mielno and Unieście.
Jamno covers an area of over ; its maximum length is and its maximum breadth is . Its greatest depth is . The lake is popularly used for sailing.
An examination of this lake from 2007 shows it is a brackish coastal lagoon that at that time was heavily polluted by sewage from the nearby city of Koszalin.Dzika, et al., pp. 222-5.
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