The Mid-Atlantic Sports Network (MASN) is an American regional sports network owned as a joint venture between two Major League Baseball franchises, the Baltimore Orioles (which owns a controlling 77% interest) and the Washington Nationals (which owns the remaining 23%). Headquartered in Baltimore, Maryland, the channel broadcasts regional coverage of sports events in the Baltimore–Washington metropolitan area.

MASN is available on approximately 23 cable and fiber optic television providers in Maryland, the District of Columbia, Virginia, eastern and central North Carolina, West Virginia, south central Pennsylvania and Delaware (on providers such as Comcast, Cox Communications, RCN, Mediacom, Charter Communications and Verizon FiOS, covering an area stretching from Harrisburg, Pennsylvania to Charlotte, North Carolina); it is also available nationwide on satellite via DirecTV and Dish Network.