The Subspecies of lucanid beetle Cyclommatus metallifer (Boisduval, 1835) from Indonesia are revised here. Six subspecies were known from Indonesia. Among them, Cyclommatus metallifer otanii Mizunuma and Nagai, 1991 was confirmed to be a synonym of Cyclommatus metallifer aenomicans Parry, 1863. Moreover, a new subspecies, Cyclommatus metallifer butonensis ssp. nov., is described from Buton Island of Indonesia. The identification key, distributional data, photos of adult habitus, male genitalia, and figures for each species are provided.

• Eunjoong Kim(Department of Ecological Science, College of Ecology and Environmental Sciences, Kyoungpook National University)
• Jinyoung Park(Department of Nature Survey, National Institute of Ecology)
• Jong Kyun Park(Department of Ecological Science, College of Ecology and Environmental Sciences, Kyoungpook National University, Major in Applied Biology, College of Ecology and Environmental Sciences, Kyoungpook National University)