Duke of Gloucester (/ˈɡlɒstər/ ^ⓘ GLOST-ər) is a British royal title (after Gloucester), often conferred on one of the sons of the reigning monarch. The first four creations were in the Peerage of England and the last in the Peerage of the United Kingdom; the current creation carries with it the subsidiary titles of Earl of Ulster and Baron Culloden.

This article relies largely or entirely on a single source. (October 2019)

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Dukedom of Gloucester
Arms of Prince Richard, Duke of Gloucester
Creation date	31 March 1928
Creation	Fifth
Created by	George V
Peerage	Peerage of the United Kingdom
First holder	Thomas of Woodstock
Present holder	Prince Richard
Heir apparent	Alexander Windsor, Earl of Ulster
Remainder to	the 1st Duke's heirs male of the body lawfully begotten
Subsidiary titles	Earl of Ulster Baron Culloden
Status	Extant
Former seat(s)	Barnwell Manor

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The title was first conferred on Thomas of Woodstock, the thirteenth child of King Edward III. The title became extinct at his death, as it did upon the death of the duke of the second creation, Humphrey of Lancaster, fourth son of King Henry IV.

The title was next conferred on Richard, brother to King Edward IV. When Richard himself became king, the dukedom merged into the crown. After Richard's death, the title was considered ominous, since the first three such dukes had all died without issue to inherit their titles. The title was not awarded for over 150 years: the next to receive the dukedom was the son of King Charles I, Henry Stuart, upon whose death the title again became extinct.

Prince William, son of the future Queen Anne, was styled "Duke of Gloucester" for his whole life (1689–1700), but was never formally created duke. Frederick, Prince of Wales, was styled "Duke of Gloucester" from 1718–1726, but was then created Duke of Edinburgh rather than of Gloucester.

There was next a creation of a double dukedom (not two dukedoms) for the brother of King George III, Prince William Henry, his proper title becoming "Duke of Gloucester and Edinburgh".

The fifth and most recent creation was for Prince Henry, third son of King George V, styled as His Royal Highness The Duke of Gloucester. Upon Prince Henry's death, the dukedom was inherited by his only surviving son Prince Richard, who still holds the title. The heir-apparent to the title is Alexander Windsor, styled Earl of Ulster. The next in the line of succession is the Earl of Ulster's son Xan Windsor, known by his grandfather's third title of Lord Culloden. The royal dukedom will devolve into an ordinary one when inherited by Alexander Windsor; as a great-grandson of a sovereign he is not entitled to royal style, and will be styled as His Grace The Duke of Gloucester.

• Arms of Thomas of Woodstock: Royal arms of England (arms of his father King Edward III) with difference a bordure argent
• Arms of Humphrey of Lancaster, 1st Duke of Gloucester: Arms of King Henry IV differenced by a bordure argent
• Arms of Thomas of Lancaster, 1st Duke of Clarence, second son of King Henry IV. Blason: Arms of King Henry IV a label of three points argent each charged with three ermine spots and a canton gules. Later borne by Richard, Duke of Gloucester (later King Richard III).
• Coat of arms of Henry as a son of the Sovereign
• Prince William's Coat of Arms
• Coat of Arms of Henry, the Duke of Gloucester
• Coat of Arms of Prince Richard, Duke of Gloucester
• Coat of arms of Alexander Windsor, Earl of Ulster, eldest son of the Duke, & heir to the Dukedom of Gloucester

• List of dukedoms by reign
• Earl of Gloucester
• Duchess of Gloucester