Maryland Route 824 (MD 824) is a state highway in the U.S. state of Maryland. Known as Blythedale Road, the state highway runs 1.06 miles (1.71 km) from MD 222 north to MD 222 and MD 275 within Perryville in southwestern Cecil County. MD 824 is the old alignment of U.S. Route 222, which is now MD 222, in Perryville. MD 824 was designated on the old road after US 222 was realigned for its interchange with Interstate 95 (I-95) in the early 1960s.

MD 824 begins at an intersection with MD 222 (Perryville Road) and the entrance to Perryville Outlet Center between downtown Perryville and MD 222's interchange with I-95 (John F. Kennedy Memorial Highway). The state highway starts east as Reservoir Road but immediately turns north along two-lane Blythedale Road through a forested area with scattered residences. After passing under I-95 and intersecting Principio Road, MD 824 curves to the west toward its northern terminus at a four-way intersection with MD 222 and MD 275. MD 222 heads south toward the I-95 interchange as Perryville Road and west as Bainbridge Road toward Port Deposit, while MD 275 and MD 222 Truck head north as Perrylawn Drive toward Rising Sun.

MD 824 is the old alignment of US 222 (now MD 222). Blythedale Road was paved by 1921. MD 824 was assigned to Blythedale Road after MD 222 was moved to its present alignment for its interchange with I-95 in 1963.

The entire route is in Perryville, Cecil County.