List of longest-living members of the British royal family

Twenty-eight members of the British royal family have lived to the age of 80 years or older since the Acts of Union 1707 established the Kingdom of Great Britain. These British royal family members consist of 2 centenarians, 9 nonagenarians, and 17 octogenarians.

Of the British royals who have lived to 80 years or longer, 20 have been women and 8 have been men. Eighteen of the 28 royals aged 80 or older have been members of the British royal family by blood and 9 have been members through marriage. Of the royals to reach the age of 80 or older, only Princess Mary, Duchess of Gloucester and Edinburgh (1776–1857), was a member of the British royal family by both blood and marriage. Four of the British royals who lived 80 years or longer were deprived of their British peerages and royal titles in 1919 under the Titles Deprivation Act 1917 as the children or spouses of enemies of the United Kingdom during World War I and are indicated below with asterisks (*).

The longest-living member of the British royal family has been Princess Alice, Duchess of Gloucester (1901–2004), who lived to 102 years and 239 days old. The longest-living member of the British royal family from birth is Princess Alice, Countess of Athlone (1883–1981). Queen Elizabeth The Queen Mother (1900–2002) is the second-longest living British royal, living to 101 years and 238 days old. The current oldest living member of the British royal family is Katharine, Duchess of Kent (born 1933), who is the tenth longest-living British royal. Elizabeth II (1926–2022), was the longest-ever reigning British monarch (70 years, 214 days) and the fifth longest-living royal (96 years, 140 days).

List of British royal family members by lifespan
All persons are listed below by their British royal titles by birth, grant, or by marriage. However, some of these individuals are better known by other titles.