Darbu is a village within the parish of Fiskum, in the municipality of Øvre Eiker, Buskerud County, Norway. The population of the village was 539 as of 2019. Darbu is located on the Sørland Line Railway, 81.61 km from Oslo, about midway between Kongsberg and Hokksund. Darbu Station was opened in 1871 when the railway branch line between Hokksund and Kongsberg was completed.