| Maryland Line, Maryland | |
| Settlement Type: | Unincorporated town |
| Pushpin Map: | USA Maryland#USA |
| Pushpin Label: | Maryland Line |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location within the State of Maryland |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Baltimore |
| Unit Pref: | Imperial |
| Population As Of: | 2000 |
| Population Density Km2: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 39.7142°N -76.6539°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 21105[1] |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
Maryland Line is an unincorporated town in Baltimore County, Maryland, United States, located just south of the Mason–Dixon line below York County, Pennsylvania. It is accessible via exits 36 and 37 from I-83. In the 19th century, the community was known as "New Market," but the name was changed to avoid confusion with a town in Frederick County bearing the same name.