八甲田山（はっこうださん）は、青森市の南側にそびえる大岳（標高1,585m）を主峰とする18の山々からなる複数火山の総称。日本百名山の一つ。
「八甲田山」と名がついた単独峰が存在するわけではなく複数の成層火山や溶岩円頂丘で構成される火山群である。青森県のほぼ中央に位置し、約20km南には十和田湖が位置する。東北地方の脊梁奥羽山脈の北端である。
The Hakkōda Mountains (八甲田山系, Hakkōda-sankei) are an active volcanic complex in south-central Aomori Prefecture, Japan, in Towada-Hachimantai National Park. Often called Mount Hakkōda (八甲田山, Hakkōda-san) or simply Hakkōda (八甲田), the mountains are collectively listed as one of the 100 Famous Japanese Mountains. Its highest peak, Mount Ōdake, lies 21.3 kilometers (13.2 mi) southeast of central Aomori and 28 kilometers (17 mi) west of central Towada and has an elevation of 1,585 meters (5,200 ft). The Hakkōda Mountains are a part Ōu Mountains which make up part of the Northeastern Japan Arc, a segment of the Pacific Ring of Fire. The volcanic complex consists of fourteen stratovolcanoes and lava domes arranged into two volcanic groups. The Northern Hakkōda Volcanic Group emerges from the rim of an 8-kilometer-wide (5.0 mi) caldera that dates back to the Pleistocene. The Southern Hakkōda Volcanic Group predates the caldera.
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