Maryland Route 330 (MD 330) is a state highway in the U.S. state of Maryland. Known as Maryland Line Road, the highway runs 3.72 miles (5.99 km) from MD 299 and MD 313 at Massey east to the Delaware state line in eastern Kent County, where the highway continues as Clayton Delaney Road. Maryland Line Road was improved in 1954 but was not brought into the state highway system and designated MD 330 until the late 1980s.