The Devensian glaciation is a name for an ice age period which occurred between 120,000 and 10,000 years ago. The name is used by British geologists and archaeologists and refers to what is often popularly meant by the Ice Age.

It is a Pleistocene stage of the Quaternary period and is analogous to the Wisconsin glaciation in North America, the Weichselian glaciation in northern Europe and the Würm glaciation in the Alps. It was the final glacial phase of the Pleistocene and its deposits have been found overlying material from the preceding Ipswichian interglacial and lying beneath those from the following Flandrian stage of the Holocene.

The latter part of the Devensian includes Pollen zones I-IV, the Allerød and Bølling Oscillations and the Dryas climatic stages.