Ágúst or Agust is a given name. Notable people with the name include:
Ágúst Ævar Gunnarsson, founding member of the Icelandic post-rock band Sigur RósÁgúst Guðmundsson (born 1947), Icelandic filmmakerÁgúst Gylfason (born 1971), Icelandic footballer, currently playing for FjölnirÁgúst H. Bjarnason (1875–1952), pioneer in teaching psychology in IcelandAgust Baldursson, Icelandic born director of television commercialsDaníel Ágúst Haraldsson (born 1969), Icelandic singer-songwriter, lead-singer of the bands GusGus and Esja, formerly of the band Ný Dönsk