This category contains articles related to the native plants of Great Britain. It is a geographical, not political, circumscription. In accordance with the World Geographical Scheme for Recording Plant Distributions (WGSRPD), the category includes islands such as the Isle of Man, Shetland and Orkney. The WGSRPD does not include the Channel Islands under Great Britain, but rather as a subcategory of Category:Flora of France.

Taxa of the lowest rank are always included. Higher taxa are included only if endemic. Great Britain is included within the WGSRPD region of Northern Europe, in Category:Flora of Northern Europe.