The title of Duke of Westminster was created by Queen Victoria in 1874 and bestowed upon Richard Grosvenor, the 3rd Marquess of Westminster. The title is derived from Westminster.

The baronetcy of the Grosvenor family was created by James I in 1622. Sir Richard Grosvenor, the 7th Baronet, was created Baron Grosvenor in 1761 and in 1784 became both Viscount Belgrave and Earl Grosvenor under George III. The title Marquess of Westminster was bestowed upon Robert Grosvenor the 2nd Earl Grosvenor at the coronation of William IV in 1831.

The subsidiary titles are: Marquess of Westminster (created 1831), Earl Grosvenor (1784), Viscount Belgrave, of Belgrave in the County of Chester (1784), and Baron Grosvenor, of Eaton in the County of Chester (1761). The Marquessate is in the Peerage of the United Kingdom; the rest are in the Peerage of Great Britain. The courtesy title of the eldest son and heir to the Duke is Earl Grosvenor.

The Grosvenor family own a substantial amount of property, notably in Mayfair and Belgravia, and at least 500 roads, squares and buildings bear their name, including Grosvenor Place and Grosvenor Square.

Grosvenor Baronets of Eaton (1622)

• Sir Richard Grosvenor, 1st Baronet (1584-1645)
• Sir Richard Grosvenor, 2nd Baronet (?)
• Sir Thomas Grosvenor, 3rd Baronet (1656-1700)
• Sir Richard Grosvenor, 4rd Baronet (1689-1732)
• Sir Thomas Grosvenor, 5th Baronet (1693-1733)
• Sir Robert Grosvenor, 6th Baronet (d. 1755)
• Sir Richard Grosvenor, 7th Baronet (1731-1802) (created Baron Grosvenor in 1761 and Earl Grosvenor in 1784)

Earls Grosvenor (1784)

• Richard Grosvenor, 1st Earl Grosvenor (1731-1802)
• Robert Grosvenor, 2nd Earl Grosvenor (1767-1845) (created Marquess of Westminster in 1831)

Marquesses of Westminster (1831)

• Robert Grosvenor, 1st Marquess of Westminster (1767-1845)
• Richard Grosvenor, 2nd Marquess of Westminster (1795-1869)
• Hugh Lupus Grosvenor, 3rd Marquess of Westminster (1825-1899) (created Duke of Westminster in 1874)

Dukes of Westminster (1874)

• Hugh Lupus Grosvenor, 1st Duke of Westminster (1825-1899)
• Hugh Richard Arthur Grosvenor, 2nd Duke of Westminster (1879-1953)
• William Grosvenor, 3rd Duke of Westminster (1894-1963)
• Gerald Hugh Grosvenor, 4th Duke of Westminster (1907-1967)
• Robert George Grosvenor, 5th Duke of Westminster (1910-1979)
• Gerald Cavendish Grosvenor, 6th Duke of Westminster (1951-)

Heir Apparent: Hugh Richard Louis Grosvenor, Earl Grosvenor (b. January 29 1991)