The Reykjanes Fires (Icelandic: Reykjaneseldar) were a series of volcanic eruptions that took place on the Reykjanes Peninsula in south-west Iceland between approximately 1210 and 1240. They caused widespread physical and economic damage, covering large areas of the peninsula in lava and tephra and causing the mass starvation of livestock, as well as a number of deaths of people due to earthquakes. The peninsula's volcanic systems were subsequently dormant for 800 years until a fresh series of eruptions began in 2021, which have been called the New Reykjanes Fires.