The Southern Maryland Blue Crabs is an American professional baseball team based in Waldorf, Maryland. They are a member of the Freedom Division of the Atlantic League of Professional Baseball, an independent baseball league which is not affiliated with Major League Baseball. From the 2008 season to the present, the Blue Crabs have played their home games at Regency Furniture Stadium. They represent the counties of Charles, Calvert, and St. Mary's, which are located on the Southern Maryland peninsula between Chesapeake Bay and the Potomac River.

In 2006, Southern Maryland residents chose the name "Blue Crabs" in a team-sponsored fan ballot. The name refers to the indigenous blue crab, the official state crustacean of Maryland. The Blue Crabs' fanbase has the nickname of "Crustacean Nation", an allusion to the Cardinal Nation and the Red Sox Nation fan clubs of the St. Louis Cardinals and Boston Red Sox.

Charles County initiated efforts to bring affiliated professional baseball, in the form of a relocated single-A Kinston Indians team, to the Southern Maryland region in 1985, but those plans fell through. The progress made on the ballpark was reversed after Charles County commissioners voted against its financial support, instead deciding to funnel money to infrastructure projects. There were also concerns about marketability of the baseball team in a then-largely rural area. However, Southern Maryland's population boomed soon after as the suburban expansion of Washington, D.C. encompassed the region.

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