Storstrøm County (Danish: Storstrøms Amt) is a former county (Danish: amt) on the islands of Zealand (Sjælland), Møn, Falster, Lolland and some minor islands in southeast Denmark.
The county was abolished effective January 1, 2007, when it merged into Region Sjælland (i.e.
The county was a somewhat artificial construction as the islands of Lolland and Falster did not traditionally share any institutions with Zealand, but rather with Funen.
Locally, the adjectives nordenstrøms and søndenstrøms, i.e. "north" and "south of the Stream" were used to designate the Zealand-Møn and Lolland-Falster parts respectively, as they were separated by the strait Storstrømmen ("The Great Stream") from which the county derived its name.
This coat of arms drifted out of use during the last years of the county's existence, and had effectively been replaced by a logo showing one of the Farø Bridges which span the Storstrømmen Strait, thus linking the northern and southern part of the county.