Maryland Route 277 (MD 277) is a state highway in the U.S. state of Maryland. The state highway runs 2.51 miles (4.04 km) from Elk Mills east to MD 279 near Elkton in northeastern Cecil County. MD 277 was paved west of MD 316 by 1921 and was extended east to MD 279 in the mid 1980s.

MD 277 begins at an arbitrary point on Elk Mills Road in the community of Elk Mills about 250 feet (76 m) west of the entrance to Elk Mills Community Park. Elk Mills Road continues west as a county highway toward MD 213. MD 277 heads east through a residential area, crossing CSX's Philadelphia Subdivision at grade and then over Big Elk Creek. The state highway enters a forested area along the edge of a quarry before meeting Appleton Road, which heads south as MD 316. MD 277 continues east as Fletchwood Road past a distribution center and through a residential area before reaching its eastern terminus at MD 279 (Elkton Road) northeast of Elkton and just west of the Delaware state line.

MD 277 was paved west of MD 316 by 1921. The state highway was extended east to MD 279 around 1985.

The entire route is in Cecil County.