Maryland Route 520 (MD 520) is a state highway in the U.S. state of Maryland. Known as Whites Neck Road, the state highway runs 2.61 miles (4.20 km) from a dead end at a boat ramp north to MD 239 near Bushwood in western St. Mary's County. MD 520 was constructed in 1933.

MD 520 begins at a boat ramp at the southern end of Whites Neck adjacent to the mouth of Whites Neck Creek at St. Catherine Sound, an embayment of the Wicomico River. The 18-foot (5.5 m) wide two-lane state highway heads west then north through farmland. MD 520 veers northeast through a forested area before crossing Whites Neck Creek and reaching its northern terminus at MD 239 (Bushwood Wharf Road) near the community of Bushwood.

MD 520 was constructed as a gravel road in 1933. The state highway was widened and resurfaced with bituminous concrete in 1956. MD 520 has changed very little since then.

The entire route is in Bushwood, St. Mary's County.