List of British Isles species extinct in the Holocene

This is a list of wild British Isles species extinct in the Holocene that covers extinctions from the Holocene epoch, a geologic epoch that began about 11,650 years before present (about 9700 BCE) and continues to the present day. The British Isles includes the islands of Great Britain and Ireland.

During much of the Neogene and Pleistocene, the British Isles were connected to mainland Europe by a land bridge called Doggerland. Changing glacial and interglacial climates repeatedly altered which species could survive there. The climate began to warm again around 9700 BCE, entering the present climatic period known as the Holocene. Animals repopulated Britain and Ireland. Rising sea levels after the end of the Last Glacial Period helped isolate Britain from mainland Europe, and Great Britain was finally cut off from the continent around 6225–6170 BCE, when the Storegga Slide tsunami flooded Doggerland.

In the early Holocene, warming temperatures and rising sea levels reduced or eliminated habitats used by some cold-adapted species. Later losses were attributed to humans, including hunting, habitat destruction, and the introduction of non-native species. Because Britain and Ireland are islands, depleted populations were less able to recolonize once they disappeared.