Introduction.- Historical review of research on Arctic and Subarctic Aleocharinae.- Material and methods.- Impact of climate change on northern fauna and flora.- Aleocharinae as indicators of change.- Faunal analysis and discussion.- Key to tribes occurring in Arctic and Subarctic zones.- Tribe Gymnusini Heer, 1839.- Tribe Aleocharini Fleming, 1821.- Tribe Oxypodini C.G. Thomson, 1859.- Tribe Tachyusini C.G. Thomson, 1859.- Tribe Hypocyphtini Laporte, 1835.- Tribe Myllaenini Ganglbauer, 1895.- Tribe Liparocephalini Fenyes, 1918.- Tribe Homalotini Heer, 1839.- Tribe Placusini Mulsant and Rey, 1871.- Tribe Athetini Casey, 1910.- Tribe Falagriini Mulsant and Rey, 1873.