Lofa is a county in the northernmost portion of the West African nation of Liberia. One of 15 counties that comprise the first-level of administrative division in the nation, it has six districts. Voinjama serves as the capital with the area of the county measuring . As of the 2008 Census, it had a population of 270,114, making it the fourth most populous county in Liberia.
Lofa's County Superintendent is Galakpai Kortimai. The county is bordered by Bong County to the south and Gbarpolu County to the west. The northwestern parts of Lofa border the nation of Sierra Leone and the northeastern parts border Guinea. Mount Wuteve, the highest mountain in Liberia, lies in the north-central part of the county.