The climate of the Atlantic period in palaeoclimatology, the warmest and moistest Blytt-Sernander period, pollen zone and chronozone of Holocene north Europe, is generally warmer than today.

It was preceded by the Boreal, with a climate similar to today’s, and is followed by the Sub-Boreal, a transition to the modern.

Because it is the warmest period of the Holocene, the Atlantic is often referenced more directly under Holocene climatic optimum, or just climatic optimum.