The Allerød Oscillation is the name given to a brief temperature increase towards the end of the last Ice Age in Europe between c. 10,000 and 9,000 years ago. It is named after the type site of Allerød in Sjaeland in Denmark where deposits created during the period were first identified in 1901 by Hartz and Mithers.

It is a substage of the Devensian Late Glacial Period and a similar weather change also took place in North America where it is known as the Two Creeks Interval . It is sometimes called the Windermere Interstadial in Britain, and the Woodgrange Interstadial in Ireland.