哈福德县（Harford County, Maryland）是美国马里兰州东北部的一个县，北邻宾夕法尼亚州。面积1,364平方公里。根据美国2000年人口普查，共有人口218,590人。县治贝莱尔 (Bel Air)。

成立于1773年。县名纪念弗雷德里克·卡尔弗特的私生子亨利·哈福德，殖民地时期最后一任总督。

Harford County is a county in the U.S. state of Maryland. As of the 2010 census, the population was 244,826. Its county seat is Bel Air.

Harford County is included in the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area, which is also included in the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area.